Peanut Butter Lover’s Monster Cookies
These peanut butter monster cookies amp up the peanut butter flavor with peanut butter chips and Reese’s Pieces!
Have you heard of monster cookies? If you have not yet been acquainted, they boast a peanut butter dough that is loaded to the brim with oats, chocolate chips and M&M’s. On top of that, they’re baked up BIG. If you know me at all, you know this is a huge selling point for me for any cookie! Suffice it to say, monster cookies are pretty phenomenal.
Back in the fall I turned monster cookies into a bar treat and made monster cookie bars, which were great for feeding a crowd! As soon as I made them, I immediately got the wheels turning on a major peanut butter version because there was so much potential! I finally got around to making it happen and, let me tell you, if you love peanut butter, you are going to go bonkers over these cookies!
I used the same peanut butter-based dough and kept it loaded with oats, but I gave a big peanut butter oomph to all of the add-ins. I cut the chocolate chips in half and added peanut butter chips, and swapped the M&M’s for Reese’s Pieces because if you’re a peanut butter lover, Reese’s Pieces trumps plain M&M’s every single day of the week.
These peanut butter monster cookies turned out even better than I had hoped. The cookies are slightly soft but thick and substantial, they have a ton of chewy texture from the oats, and there is so much peanut butter flavor, along with a bit of chocolate, as well. Perfection!
If you’re a fellow peanut butter lover, you’re going to adore these cookies! Get baking!
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Peanut Butter Lover's Monster Cookies
Ingredients
- ½ cup (113.5 g) unsalted butter, at room temperature
- 1 cup (220 g) light brown sugar
- ½ cup (129 g) creamy peanut butter
- 1 egg
- 2 teaspoons vanilla extract
- ¾ cup (93.75 g) all-purpose flour
- 1 teaspoon baking soda
- ¼ teaspoon (0.25 teaspoon) baking powder
- 1 teaspoon cornstarch
- ¼ teaspoon (0.25 teaspoon) salt
- 1½ cups (121.5 g) old-fashioned oats
- ½ cup (90 g) semisweet chocolate chips
- ½ cup (85 g) peanut butter chips
- 1 cup (188 g) Reese's Pieces candies
Instructions
- Preheat oven to 350 degrees F and line two baking sheets with parchment paper.
- In a small bowl, whisk together the flour, baking soda, baking powder, cornstarch and salt; set aside.
- Using an electric mixer, beat the butter, brown sugar and peanut butter on medium speed until light and fluffy, about 3 to 4 minutes. Add the egg and vanilla extract and beat to combine.
- Reduce the mixer speed to low and slowly add the flour mixture to the wet ingredients and mix until just combined. Using a rubber spatula, stir in the oats, chocolate chips, peanut butter chips, and Reese's Pieces candies by hand.
- Measure out ¼ cup balls of dough and place them on the baking sheets, at least 2 inches apart. Flatten slightly with the palm of your hand. Bake until the edges are just starting to brown and the top still looks slightly undercooked, about 11 to 13 minutes.
- Remove from the oven and cool for 5 minutes on the baking sheet before transferring them to a wire rack to cool completely. Cookies can be stored in an airtight container at room temperature for up to 4 days.
Notes
Did you make this recipe?
Leave a review below, then snap a picture and tag @thebrowneyedbaker on Instagram so I can see it!
OMG! I’ve really wanted monster cookies for the past two weeks, but when I get home at night, I don’t feel like baking. Now I’ll have to make both kinds because these look so good. Thank you BEB. octordle
I am a huge Reece’s Pieces fan. Somehow, I’ve never had them in anything baked. We’ll, that’s now been corrected. These are soo yummy, and they do come out exactly as described. It’s soo hard not to just gobble them all up. Thank you for this great recipe!
I made these today and got 16 cookies using 1/4 cup measurement, mine took 13 minutes. They are puffy, big, and delicious 😋
I love this recipe! Thank you! I use only semisweet chocolate chips and Reese’s Pieces in mine per my own taste and they are perfect. They are the perfect snack for hikes. Plenty of energy from the peanut butter, oats, and chocolate, plus they are very filling.
These were so incredibly easy to make, also incredibly easy for them to disappear! These are a big hit with my husband and daughter!
My husbands all time favorite, I literally make them every week. They are his work snack.
Hello,
I have made these cookies a few times before and they never disappoint. Simply wonderful! I am planning to make them for a gluten free eater. I was wondering if you know what the best substitute would be for the 3/4 cup of flour? Could I possibly use coconut flour?
Thanks for the delicious recipes!
Hi Kylie, I haven’t done anything in the way of gluten-free baking, unfortunately :( I couldn’t say for sure what might work; have you tried a gluten-free blend? I know they sell some of those at the grocery store.
I love soft, thick, cakey cookies. These look amazing.
I finally got around to making these cookies over the weekend, and OMG! Why did I wait so long? I only recently discovered the concept of monster cookies (I know, late to this party) but I now realize have to make up for lost time. I used PB M&Ms instead of Reese’s Pieces because they were on sale. I usually take my baked goods into to work to share, but these are so good that I don’t think they’ll leave my kitchen.
These cookies are great just from the oven, but even more amazing you can freeze them after baking and when you thaw them out they will be just as chewy and good as they were when they were fresh. Recipe is easily halved or doubled. Yummy!
Curious, what’s the yield?
Planning on making these for a Halloween party and want to make sure I make enough.
18 to 20 cookies (it’s listed in the headnotes of the recipe above)
I make these with steel cut oats and they are to die for!!!
I’m new to this site, but an avid baker. I tried these out over the weekend and they were delicious! I will be back for more recipes! Thank you for sharing.
have made them twice.a great cookie! thanks
I made these yesterday, and they are so easy to make and really good! Thank you for the recipe!
Yum! I just made these. So easy and tasty with a fantastic consistency. A keeper!
I made these over the weekend. They are awesome! Your recipes are always great, and you are a go-to source for me. Thank you so much.
made these cookies this weekend and they were a big hit!
Hi Joan, I’m so glad you enjoyed them!
Wow these look so delicious! I would appreciate it if you would check out my blog. You were a huge inspiration for starting my own. Thanks!
How about peanut butter M&Ms?
Um, YES!
Oh wow, these look incredible! I can’t wait to try them.
Kara
http://www.pepandprose.com
Chocolate chip cookies are always delicious but Monster cookies are such a fun take for extra goodies!
Kari
http://www.sweetteasweetie.com
What kind of texture do these cookies have? And what does the cornstarch add to the recipe? Thanks!
Hi Lisa, They are chewy, not crispy, but are not overly soft, more thick and dense. The cornstarch helps to give the crumb a little bit of a lighter texture.
Love your take on them. When I make monster cookie bars, half of theM&M’s I use Peanut butter M&M’s. Just another suggestion for you. This idea came from my MIL, when she ran out of regular M&M’s while making them she threw in the Peanut butter ones she had. Best addition ever!
Ahhh, SO SMART! I don’t keep those in the house because I would eat an entire bag in less than one day. Not even kidding.
Giant cookies are the best! These look scrumptious! Can’t wait to bake!
I am so with you on a love of giant cookies! I keep wanting to make monster cookies with reese’s pieces but I’m glad I saw this first. Pb chips sound like an awesome addition.
Amazing! Dreamy! A Necessity! THANK YOU!!!
OMG! I’ve been craving monster cookies in the worst way the past two weeks but haven’t felt like baking when I get home at night. Now I’m going to have to make both kinds because these look marvelous. Thanks BEB!
Wowza! That looks like an amazing cookie…adding it to my list to try out…makes me hungry just looking at it.