Monster Cookies

Monster Cookies

Monster cookies are everything good that there is about cookie-baking and candy-eating. They are sometimes referred to as “kitchen sink cookies” because at first glance it seems that just about everything but the kitchen sink is thrown into these cookies. Peanut butter, oats, chocolate chips, M&M’s, Reese’s Pieces… They are basically the Peanut Butter-Oatmeal Chocolate Chip Cookies on steroids. Not only more ingredients, but bigger too. The monster cookies go the no-holds-barred route when it comes to size. And when it comes to cookies (at least in my book), bigger is always better. Which is probably why the Thick and Chewy Chocolate Chip Cookies and the Chewy Oatmeal-Raisin Cookies are two of my absolute favorites. Big, thick, chewy. Love ‘em. And I love these.

Monster Cookies

The fabulous thing about these cookies is that they are totally adaptable to your tastes and you can go hog wild in creating the perfect cookie for you. The original recipe calls for butterscotch chips (not Reese’s Pieces) but with peanut butter in the batter, and because I have a serious love affair with Reese’s Pieces, I decided to nix the butterscotch chips for Reese’s Pieces. You could also use peanut butter chips, which would be fabulous as well. Really, whatever you like, throw in! I think chopped nuts would be great too. I somewhat included nuts by using chunky peanut butter instead of creamy, but that’s really a personal preference. I briefly considered peanut M&M’s but figured they would be too big for the cookies (probably a good call). The key here is to make the monster cookies your monster! Dig deep and channel that inner mad scientist.

What would your ultimate monster cookie have in it?

(I looked high and low for red, white and blue M&M’s to use in these – they would be great to take to a 4th of July picnic this weekend! – but I couldn’t find any.)

Monster Cookies

One year ago: No Bake Cookies (The most popular recipe on the site!)
Two years ago: Wedding Shower Cake

Monster Cookies

Yield: 26 large cookies

Prep Time: 45 minutes

Cook Time: 10-12 minutes per baking sheet

Total Time: 1 hour

Ingredients:

3 eggs
1 cup granulated sugar
1 cup light brown sugar
1 teaspoon vanilla extract
1 teaspoon corn syrup
2 teaspoons baking soda
1 teaspoon salt
½ cup (4 ounces, or 1 stick) unsalted butter, melted
1½ cups chunky peanut butter
4½ cups rolled oats
½ cup all-purpose flour
¾ cup chocolate chips
¾ cup Reese's Pieces
¾ cup M&M's

Directions:

1. Preheat the oven to 350 degrees F. Line three baking sheets with parchment paper or silicone baking mats. (If you don't have three baking sheets, just be sure to cool the ones coming out of the oven before placing more cookie dough on them. If I'm short on sheets I will run them under cold water to cool them down.)

2. In a large mixing bowl, stir together the eggs, both sugars, vanilla extract, corn syrup, baking soda and salt. Then stir in the melted butter and peanut butter, followed by the oats and flour. Lastly, stir in the chocolate chips, Reese's pieces and M&M's. Let the dough rest for 30 minutes.

3. Drop the dough by ¼ cupfuls onto baking sheets (if weighing, each ball of dough was approximately 2.7 oz or 77g). Use your fingers to flatten the dough slightly. Baking for 10-12 minutes, or until the cookies are a light golden brown. Cool on a rack and then store in an airtight container at room temperature.

*Note: I found that since I used both M&M's and Reese's Pieces, some of the candy pieces fell out when scooping the cookies if a particular ball of dough was overrun with both. Not a big deal, just know that you might lose some candy.

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63 Responses to “Monster Cookies”

  1. Eliana on June 30, 2010 at 9:29 am

    I once had a cookie like this that had chopped pretzels in it. Tasted so damn good!

    Reply

  2. Judy B. on June 30, 2010 at 9:39 am

    Will have to try these cookies…they would be festive with red/white/blue M&Ms. Try looking at Walmart for the different colors M&Ms…I’ve seen them in individual tubs – sold by color. They were located where the large packaged candies are displayed. If you have a Michael’s in your area, they also sell them – individual tubs. They are on the “high” side, but at least you get what you want.

    You can also buy red/white/blue sprinkles in a small plastic container.

    Thanks for sharing your wonderful recipes!!

    Reply

    • Michelle on June 30th, 2010 at 10:23 am

      Hi Judy, Thanks for the tip! I did look at Wal-Mart for the M&M’s in the section you mentioned but didn’t find any. I didn’t check Michael’s though, I will definitely do that next time!

      Reply

    • HatfullofCrazy on October 26th, 2012 at 4:23 pm

      Try the candy section at Wegmans also (if you have one) I believe they sell M&M’s by color in the Bulk Section! Party stores like Party CIty carry individually colored M&M’s but they’re $7.99 a bag (in Northern VA anyway).

      Thanks Judy for the Pretzel idea. The man will LOVE that.

      Reply

  3. linda on June 30, 2010 at 9:39 am

    these look great… your recipe looks wonderful & sweet….& a great way to use up chocolates, chips etc.!
    i am going to prep/ assemble & freeze the dough balls…& bake fresh out of the oven for july 4th!
    THANKS!

    Reply

  4. Maria on June 30, 2010 at 10:07 am

    I am making these tonight!

    Reply

  5. urmomcooks on June 30, 2010 at 10:49 am

    Peanut butter oatmeal chocolate chip cookies — the best!!! Ur add-ins only make this taste sensation sound even better!!!

    Reply

  6. Amy on June 30, 2010 at 11:38 am

    I think I spotted a puddle of drool under my office chair…..

    Reply

  7. brian @ howtobaker on June 30, 2010 at 11:43 am

    I love cookies that have tons of add-ins. The recipe and pictures look great! I’m heading to a friend’s house this weekend for a BBQ and will have to take these along for the ride.

    Reply

  8. Just Food Snobs on June 30, 2010 at 12:04 pm

    Thanks for sharing the yummy cookie recipe! My son would love these.

    Reply

  9. Lauren on June 30, 2010 at 12:10 pm

    Yum— these make me want to break into the highest part of the pantry where the m&ms are “hidden” and get baking! Everything you create is so pretty and inviting, and these little cookies are no exception. Can’t wait to see what’s next.

    - Lauren, Lauren’s Little Kitchen

    Reply

  10. Katrina on June 30, 2010 at 12:18 pm

    This is such a classic recipe. I loved having these as a kid!!

    Reply

  11. Amanda on June 30, 2010 at 12:47 pm

    I’ve made these before and they are delicious. Nice and chewy but soft and scrumptious. Now you got me thinking that I need to make them again!

    Reply

  12. Tracy on June 30, 2010 at 1:16 pm

    Love it! I can’t wait to experiment with my own! :-)

    Reply

  13. C&C Cakery on June 30, 2010 at 1:17 pm

    These are more filling than cookie! What a wonderful recipe for kids – I’m sure this would be fun to mix and bake together (and, of course, eat them!)

    Reply

  14. CC Recipe on June 30, 2010 at 2:29 pm

    These monster cookies look Fab, I will have to give them a try next time I bake cookies, we seriously love some Reese’s Pieces at our house!

    Reply

  15. The Housewife on June 30, 2010 at 2:33 pm

    These are great with the M&Ms peeking out… how can any kid (of any size and age!) say no to these?

    Reply

  16. Jen @ How To: Simplify on June 30, 2010 at 2:39 pm

    These cookies look awesome! I would love to enjoy a few of these with a cold glass of milk!

    Reply

  17. The Chocolate Priestess on June 30, 2010 at 3:56 pm

    I tried a mix for Monster cookies that added raisins and peanuts and we were not impressed. I’ll settle for just a multitude of different chocolates thank you very much.

    Reply

  18. bakingaddict on June 30, 2010 at 6:20 pm

    Wow these look amazing!! I’m such a cookie monster – this is going straight to the top of my to bake list. Thanks :)

    Reply

  19. Baking Serendipity on June 30, 2010 at 8:08 pm

    I love monster cookies! The Reese’s Pieces make an awesome addition…I’ll have to try that next time!

    Reply

  20. Cook with Madin on June 30, 2010 at 8:30 pm

    These are gorgeous cookies. My husband will truly love these, especially that you mentioned peanut butter, that is his favorite.

    Reply

  21. Belinda @zomppa on June 30, 2010 at 10:10 pm

    I’m going hog wild for yours!!

    Reply

  22. Sommer @ Spicy Perspective on June 30, 2010 at 10:26 pm

    What fun! I love how colorful they are! These look like Wonka cookies to me!

    Reply

  23. Heidi on June 30, 2010 at 10:42 pm

    Just bought a few packs of Pretzel M&M’s (had 2 buy one get one free coupons) which I think would be fab in these Monsters. Sounds like the perfect ride-out-the-edge of Tropical Storm Alex baking project.

    Reply

  24. Sara on June 30, 2010 at 11:38 pm

    I love monster cookies! A little bit of everything. :)

    Reply

  25. jenn on July 1, 2010 at 12:56 am

    i’ve made a version of “monster cookies” before… but yours look amazing! never thought of reese’s pieces! yumm!

    Reply

  26. Alison Lewis on July 1, 2010 at 8:50 am

    These look awesome! When I used to work at Southern Living Magazine, we made these all of the time. Your version looks wonderful. Love your site!

    Reply

  27. Cheah on July 1, 2010 at 12:45 pm

    Fantastic monsters you have out there! They look good and very attractive too!

    Reply

  28. Steve on July 1, 2010 at 8:22 pm

    There is a local coffee shop here in Vancouver that makes it’s own monster sized cookies. Orange cranberry with white chocolate chunks. I could eat myself silly on those if I still worked next store to that shop.

    Reply

  29. Maggy@ThreeManyCooks on July 2, 2010 at 8:38 am

    Love the look of these cookies. So fun!

    Reply

  30. Avanika (Yumsilicious Bakes) on July 2, 2010 at 10:28 am

    I LOVE monster cookies, these look delicious!!!

    Reply

  31. Paula on July 2, 2010 at 12:43 pm

    how crazy cookies :)

    Reply

  32. Susanna on July 2, 2010 at 10:07 pm

    I remember making these a lot as a kid. These bring back some good memories. I just might have to make a batch soon.

    Reply

  33. Magic of Spice on July 3, 2010 at 3:05 am

    What pretty Monster cookies…They look so good!

    Reply

  34. Debbie on July 6, 2010 at 10:23 am

    YUMM! These look great, I think I would even add in some marshmallows in there to seal the deal! And about those no-bake cookies, I think I go to that recipe everyday and dream of how good and easy they look, except the hubby doesn’t like oatmeal so I haven’t made them yet!

    Reply

  35. Ashley on July 7, 2010 at 6:56 pm

    I tried making monster cookies before but they weren’t quite as I remembered. These look like they might be closer to the ones I used to have. Swapping out the butterscotch chips for Reese’s Pieces sounds perfect to me. I’ve seen these Almond Joy pieces that I’ve been intrigued about and I’m thinking they might be yummy in here!

    Reply

  36. sumac on August 4, 2010 at 12:46 am

    Stop eating the mixture! These are a fantastic alternative to a standard choc chip cookie. I put in m&m’s and smashed up jaffas. Yum.

    Reply

  37. Michelle on August 8, 2010 at 10:07 am

    Hey Michelle – I’ve made these a couple of times (so delicious!), but they seem to come out much flatter than yours. Any idea why this happens? Do you let the butter cool a bit before you add it…I’m thinking this might be my problem. Love your site!

    Reply

  38. foodlvr on August 27, 2010 at 11:31 am

    Chocolate Chocolate Chip Cookies with Dark Chocolate Chips and M&M’s would be excellent. Or the Dark Chocolate M&M’s would be even better. Use really good chocolate and really good cocoa – the better the ingredients the better the taste.

    Reply

  39. Londa on October 1, 2010 at 11:17 pm

    Yum! There’s a reason your recipe pops up #1 in a google search for monster cookies! We made them tonight and they are so delicious! I’ve tried tons of different recipes, but your’s is definitely the best!

    Reply

    • Michelle on October 3rd, 2010 at 10:36 am

      Thanks Londa! Great to hear your review, I’m so glad you loved these cookies!

      Reply

  40. Cristina on October 24, 2010 at 6:20 pm

    My husband is very picky when it comes to Monster Cookies and he LOVES these! They turned out fluffy, soft, chewy, and oh so delicious! Thanks for the great recipe!

    Reply

    • Michelle on October 24th, 2010 at 7:34 pm

      Yay! I’m glad these got your hubby’s approval!

      Reply

  41. Katie on October 29, 2010 at 8:40 pm

    I have always wanted to make Monster Cookies, and tonight, listening to the Monster Mash over and over with my 3 year old, I decided THIS was the night. My son was very excited to help make these, and sang Monster Mash the whoooole time. I made a few changes based on what I had- half butter half shortening, no corn syrup (I figured no biggie cause it was a tiny amount, but maybe it was a biggie?) and did chocolate chips, peanut butter chips, butterscotch chips and chopped pretzels! Now, I know it would be much better to have the candy coated kind because they are much more fun looking. But anyway, I used an ice cream scoop and got 36 cookies. I baked 6, thinking they would spread a lot, and they didn’t. they stayed in little mounds! After 12 minutes they were still totally balls. After 20 (yikes!) i decided to take them out. I cooled a bit and just ate one- yum. They are a little crisp outside and warm and soft inside- i hope they don’t get too hard as they cool since I baked so long. Do you think it was the shortening and lack of corn syrup that caused them not to spread?

    Reply

    • Michelle on October 30th, 2010 at 8:28 pm

      Katie, How cute about your son singing “Monster Mash” while helping you bake! Love it! The shortening could have been the culprit here. I have seen it called for in sugar cookie recipes specifically because it keeps the shape of the cut out cookies, and keeps them from spreading.

      Reply

  42. Paula on December 11, 2010 at 2:37 pm

    I tried yesterday this recipe, and we are already thinking in cooking it again, so you can imagine the success. The only “problem” is that, at home, I only had M&M’s with peanut, but I crushed them and it was also ok.
    Thanks for the recipe, it’s really easy and very, very delicious!!

    Reply

    • Michelle on December 12th, 2010 at 11:58 pm

      I love peanut M&M’s. They need to be hidden from me ;-) Great substitute!

      Reply

  43. Kim on February 7, 2011 at 5:39 pm

    Good basic recipe, though I modified it a bit. I didn’t melt the butter. I whipped softened butter with the peanut butter first, then added the rest of the “wet” ingredients. I next added this mixture to the “dry” ingredients. I also omitted the corn syrup and reduced the brown sugar by 1/4 cup and the white sugar by 1/4 cup. In order to encourage the cookies to spread a bit, I used a few wet fingers to press each of them down a bit before baking. Divine!

    Reply

  44. Brian on July 6, 2011 at 10:39 pm

    If I wanted to go with a mint theme, do you think I could drop the peanut butter without ruining the texture or composition of the cookies?

    Thanks! Brian

    Reply

  45. Michelle K. on August 15, 2011 at 2:19 pm

    I am baking these right now but I don’t think they are coming out right and I am wondering what I did wrong! The dough is so stiff that when I put the flattened balls in the oven to bake, they basically keep that shape! It doesn’t seem to be spreading like most cookies. Has this ever happened to you before? I used all natural peanut butter since that is what I buy. Do you use all natural or something like Jiffy and do you think that would actually make a difference?

    Reply

    • Michelle on August 18th, 2011 at 10:21 am

      Hi Michelle, I actually never bake with all natural peanut butter because it’s texture is so different and it can definitely affect the outcome of baked goods. For baking, I stick with regular peanut butter, such as Jif.

      Reply

  46. the nonpareil baker on August 19, 2011 at 2:08 am

    These are officially my favorite cookies ever! I love how chewy they are and how little flour is in them. I bake things for my dad all the time, but this is the only recipe he’s requested I make again! I can’t wait to try these with different mix ins :)

    Reply

  47. Katie on September 15, 2011 at 7:37 pm

    I’ve been wanting to bake monster cookies all summer, and I finally decided to do so today. I am SO glad I did, and that I followed your recipe. These cookies are delicious and full of my favorite things. I used pretzel m&m’s because they are my new obsession, and while they are slightly bigger than the regular kind, the cookies were not too overloaded and came out perfectly. Thank you so much!

    Reply

  48. Caitlyn on February 25, 2012 at 8:13 pm

    I’ve never heard of Monster Cookies before! I made mine with chopped up Flipz (chocolate covered pretzels), chopped up Kit Kat bars, M&Ms, and mini Reeses cups – the reeeeally small ones. I used about 3/4 cup natural peanut butter (it tends to make the cookies spread out more, because it’s more oily than regular peanut butter) but otherwise I followed the recipe to a T. Let me tell you… these things look and taste SO delicious! The perfect fix for a craving! I baked up one sheet full and I’m freezing the rest for future cravings! Thanks for this delicious recipe!!

    Reply

  49. Hope on April 22, 2012 at 5:57 pm

    I make a version of these without the flour and candy….basically PB and oatmeal cookies. Increase PB to about 2-2.5 cups, eat them warm with fresh whipped cream and raspberries….we call our version Evil Cookies because my thighs think they are..haha!

    Reply

  50. Joy on July 23, 2012 at 6:05 pm

    These cookies are no joke! I cleaned out my Halloween and Easter candy–pastel m&ms and whoppers in place of the reese pieces. They’re gone now!

    Reply

  51. Erin on August 4, 2012 at 3:50 pm

    I just used Reeses Pieces and white choc. chips and they are amazing!!

    Reply

    • Michelle on August 9th, 2012 at 4:00 pm

      Sounds amazing! Glad you enjoyed them! :)

      Reply

  52. Shelby on September 11, 2012 at 3:34 pm

    I usually make these for the boys who play intramural football at the university. I brought 3 dozen for 12 guys and they finished them all! That was even after feeding them sandwiches, chips, and oranges. These are definitely my favorite cookies to bake and always a team favorite.

    Reply

  53. Alli Miller @ Cupcake Diaries on December 4, 2012 at 6:45 pm

    I featured these cookies on my blog today for National Cookie Day! Thanks so much for sharing the recipe!

    Reply

  54. Betty Riley on December 29, 2012 at 8:53 pm

    PS I created these cookies/recipe in my kitchen is Springfield, PA in 1983

    Reply

  55. R. Jones on March 23, 2014 at 7:47 pm

    I have made Monster Cookies for years and they are always a hit. These are so yummy, and can be made with any corresponding colour of M&Ms for festive occasions!
    Also – in the version I use there’s no flour, so if you are careful about the other ingredients, particularly the oats, they are a great gluten free treat!

    Reply

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