Better-Than-Box-Mix Brownies
These homemade brownies have all of the great texture and flavor of box-mix brownies, without any of the processed ingredients. They have become the base for some of my favorite brownie recipes, like peanut butter brownies, buckeye brownies, and marshmallow brownies!

Whenever I ask people what their favorite brownie is, there is always a resounding majority – most people only have eyes for box-mix brownies. And really, what’s not to love? The brownies always turn out gooey, chewy and with that amazing thin crackly crust on top. As a teenager, each Sunday night our church held youth group meetings and one of the mom volunteers always brought a pan of brownies. They were the BEST brownies. At one point a couple of us girls asked for the recipe and were sheepishly told that they were just from a box.
So many of those amazing brownie concoctions that you’ll see on Pinterest invariably start by calling for a box brownie mix, right? A number of years ago, I went on a mission to find a homemade brownie recipe that could mimic that elusive taste and texture of a box-mix brownie. Not surprisingly, it was Cook’s Illustrated that had formulated exactly what I was looking for – a homemade brownie recipe with all of the characteristics people love about a box-mix brownie.
Now, anytime I come across a recipe that calls for preparing a box of brownies, I turn to this recipe instead!

According to the headnotes for this recipe, the key to the texture of the beloved box-mix brownie is the ratio of saturated to unsaturated fat. The box-mix brownies have a 28% to 72% ratio while a classic homemade brownie recipe has a 64% to 36% ratio. Big difference! The major factors in creating this chewy brownie recipe to mimic the box-mix include: using a mix of butter and vegetable oil, a mix of cocoa powder and melted chocolate, and extra egg yolks. I guarantee that if you are in the box-mix brownie camp, this recipe will wow you. Another huge bonus is that this is still a one-bowl recipe with only a whisk and spatula needed.
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Here are a couple of quick notes to make sure these brownies turn out absolutely superb:
- For the chewiest texture, it’s important to cool brownies completely before cutting.
- If your baking dish is glass, cool the brownies 10 minutes, then remove them from the pan to a wire rack (otherwise, the heat retention of glass can lead to overbaking).
Once you try this simple recipe, you’ll never go back to those box mixes!

Four years ago: Strawberry Cream Cheese Crumble Tart

Better-Than-Box Brownies
Ingredients
- ⅓ cup (28.67 g) Dutch-processed cocoa
- ½ cup (125 ml) + 2 tablespoons boiling water
- 2 ounces (56.7 g) unsweetened chocolate, finely chopped
- 4 tablespoons unsalted butter, melted
- ½ cup (109 ml) plus 2 tablespoons vegetable oil
- 2 eggs
- 2 egg yolks
- 2 teaspoons vanilla extract
- 2½ cups (500 g) granulated sugar
- 1¾ cups (218.75 g) all-purpose flour
- ¾ teaspoon (0.75 teaspoon) salt
- 1 cup (180 g) semisweet chocolate chips
Instructions
- Adjust oven rack to lowest position and heat oven to 350 degrees F. Line a 9×13-inch baking pan with foil, leaving about a one-inch overhang on all sides. Spray with nonstick cooking spray.
- Whisk cocoa powder and boiling water together in a large bowl until smooth. Add the unsweetened chocolate and whisk until the chocolate is melted. Whisk in the melted butter and oil (the mixture may look curdled at this point, that’s okay!). Add the eggs, yolks, and vanilla extract, and whisk until smooth and homogeneous. Whisk in the sugar until fully incorporated. Add the flour and salt and mix with a rubber spatula until combined. Fold in the chocolate chips.
- Scrape batter into prepared pan and spread into an even layer. Bake until a toothpick inserted halfway between edge and center comes out with just a few moist crumbs attached, 30 to 35 minutes. Transfer the pan to a wire rack and cool for 1½ hours.
- Using the foil overhang, lift the brownies from pan. Place the brownies on the wire rack and cool completely, about 1 additional hour. Cut into 2-inch squares and serve. Brownies 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!
This recipe was originally published on March 9, 2010.



It’s a colleague’s birthday friday and I was debating making choc. chip cookies, but I think you may have swayed me. wow, look so so good!
Oh my. Those look like *just* the kind of brownies I love….moist and super chocolatey!
I have to say. The nerd in me loves that this all comes down to science.
Gotta love a fudgy chewy brownie. These look amazing.
If I ever get married, my cake will be brownies – that’s how much I love them. Can’t wait to try out this recipe and fortify it will a little chili powder!
Yum, yum and yum! Looks so good and I”m sure it tastes good too! Brownies is my weakness, especially the gooey, oooey type. Thank you for posting this.
I would like a few (pans) of these right now! Yum :)
those look SO good! the people at cook’s illustrated sure know how to do it right!
Oh, what a dreamy thought…chewy, ooey, gooey, yummy brownies. MMMM My friend make a Chocolate Caramel Brownie to serve with our lunch today. I could have eaten the whole pan!!
I read this article too! I love how they scientifically talk about each component and what it does. I actually love the brownie recipe I’ve made for the last, oh, dozen times I’ve made brownies. But these do look tempting…
I own the book. But, have not made the brownies. Looks great.
Brownies are always my favourite, especially those chewy ones. Yours look very mist and chewy….mmmm
can y’al help me plz i reallly need help for my conventional oven project i’m in ta 9th and don’t know what 2 do plz helllp me and in deserts
I had definitely earmarked that recipe when our Cook’s Illustrated arrived, and now you’ve made me want to move it to the top of the list. YUM!
oh my those look fantastic. I’m totally going to make them stat. Thanks for posting!
You got me…those look unbelieveable! The inside looks so perfectly fundgy. I can’t wait to try them! And how interesting about the fat ratios. I never would’ve thunk!
I am so glad you posted this. I just picked up this cooks illustrated and wanted to know how this recipe would turn out. These look so yummy!
You’ve done it again! These look fantastic!
wow, so much science behind a brownie…who knew?!? These look perfect, so I have no choice but to make them!!
Agh! That’s the brownie recipe I tested for them. I was hoping it would never get published, and I could use it as my secret brownie recipe forever. No such luck! But I have to say, this really is the very best from-scratch brownie recipe I have ever tried. (And I would definitely use the instant espresso.) Your pictures are beautiful and mouthwatering as always. I’m so glad I made a batch of these not too long ago and froze some of them!
CI is the best cooking magazine around, imo. The brownies look spectacular. Heh, those Ghiradelli mixes are definitely a step above Betty Crocker.
you know last week i totally overindulged in some awesome brownies and swore them off…until now! these look SOOOOOOOO incredible, way better than store-bought mixes!
I love brownies, LOVE THEM! These look so great! I love a crackly top and soft inside. Yum!
crackly, not cracky. I am going to get coffee now, to wake me up…
I think that homemade is always better than bought. But when it comes to homemade brownies, they’re just not as good as the boxed mix. I’m going to have to try this recipe very soon!
Wow, I am salivating. The cracky top won me over.
Great brownie tips! I’m pretty sure I wouldn’t be able to eat just one of these. I always appreciate the testing and re-testing that America’s Test Kitchen goes through to get the perfect recipe. I have their Family Baking Book and it’s fantastic!
I did a brownie post this week, too! Ha! Great minds. And I love America’s Test Kitchen recipes–they are always so right on and so fascinating to read the notes! Will definitely be trying this one.
mmm yum!! they look great especially after my brownie fail this weekend… i’m still craving them. fyi – low/no fat brownies = no good :-)
oh my god those look amazing. I love chewy brownies, those cakey ones just aren’t good if you ask me! I will be making these pronto!
OMG those look so good!! I love that they did a recipe that tries to mimmic the boxed version of something! I want to make this so badly! For once being able to say that I made better-than-the-box brownies!
I hope I can wait to cut into these:)
me too!
I love chewy brownies, those cakey ones just aren’t good if you ask me! I will be making these pronto. https://flirtymania.com/es.html