Peanut Butter Brookies

Name: Peanut Butter Brookies
Prep time: 5 min
Cook time: 30 min
Total time: 35 min
Ingredients: 1 7.2-ounce packet peanut butter cookie mix ((plus ingredients on package)); ¼ cup Reese’s pieces (plus more for sprinkling); 1 18-ounce box brownie mix ((plus ingredients on package))

Peanut Butter Cookie Brownie Bars featured image

Peanut Butter Cookie Brownie Bars are the best bite of 2 desserts combined into one sweet treat. It is so quick and easy to make soft and chewy brownies that bake beneath peanut butter cookie batter.

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This Peanut Butter Brookies recipe takes only 5 minutes to prepare and is my favorite way to bake two sweet treats, peanut butter cookies and brownies, at the same time in one pan.

Using a few simple shortcuts, it couldn’t be any easier to create the best bite of a chocolate brownie with a peanut butter cookie layer into a soft and sliceable square.

Peanut Butter Cookie Brownie Bars hero image

Easy Peanut Butter Brookies

A Peanut Butter Brookie recipe is an easy solution when you can’t decide between two delicious desserts.

Using only a packet of peanut butter cookie mix, a box of brownie mix, Reese’s pieces, plus the traditional baking ingredients, it is so simple to make a fudge-filled brownie base topped with peanut butter cookie batter and candy.

I love the way the peanut butter cookie brownie bars rich, dark brownie perfectly balances the creamy peanut butter flavor; it’s truly the best combination of sweet and salty baked into one brookie bar.

Imagine a moist chocolate brownie baked beneath a chewy cookie – it’s the ultimate marriage of brownie meets cookie dough and Reese’s peanut butter cups or pieces and no mixer is needed.

Quick and easy to prepare in 5 minutes.
Simple shortcut recipe uses mixes plus what’s called for on the package or box.
Fun way to combine peanut butter cookie batter with a moist brownie.
Eat some now and freeze the rest for later.
Perfectly portable dessert for potlucks, picnics, or parties.

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Rolo Brownies

Buckeye Brownies

Ingredients

Peanut butter cookie mix: You will also need the ingredients listed on the package.
Reese’s pieces
Brownie mix: You will also need the ingredients listed on the back of the box (usually water, oil, and eggs). FYI, I used the Duncan Hines brand.

Substitutions and Additions

More Mix-Ins: The peanut butter cookie recipe calls for Reese’s pieces in the batter, but you could swap in things like chopped nuts, peanut butter chips, or chopped peanut butter cups.
Brownie Base: While I love the ease and convenience of baking from a box, feel free to make homemade brownies from scratch. Some of my favorite homemade peanut butter brownie recipes include:
- Peanut Butter Cup Brownies: Make the recipe as is or swap the peanut butter cups for the peanut butter cookie batter.
- Peanut Butter Brownies: Make the recipe as is or swap the dollops of peanut butter for the peanut butter cookie batter.
Change The Cookie: Feel free to customize your cookie/brownie combination by using your favorite flavor cookie batter. Some ideas include:
- Brookie Bars: My other Brookie recipe uses chocolate chip cookie dough to top the brownie bottom.
- S’moreos: Top your brownie base with a s’more sandwich.
- Chocolate Pudding Cookies: For extra chocolate flavor, top your brownies with a chocolate cookie batter.

Recommended Tools

Parchment Paper
7×11 casserole dish

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How to Make Peanut Butter Brookies

Prepare The Peanut Butter Cookies: Follow the package directions to prepare the cookie dough. Stir in Reese’s pieces.
Make The Brownie Batter: Make the brownie batter according to the box directions and pour into a baking dish.
Pro Tip: You may need to spread around the batter to fit edge to edge of the dish.
Prepare The Pan: Add flattened cookie dough portions on top of the brownie batter. Sprinkle with Reese’s pieces.
Bake: Bake at 350 degrees Fahrenheit for 35 – 40 minutes.
Serve: Cool, slice, and serve. Enjoy!

step 1 Peanut Butter Cookie Brownie Bars

step 2 Peanut Butter Cookie Brownie Bars

step 3 Peanut Butter Cookie Brownie Bars

step 4 Peanut Butter Cookie Brownie Bars

Tip From Our Recipe Developer

Allow the cookie bars to fully cool before removing them; this makes it easier to remove them from the dish and allows them to cut better.
Serve this as a snack with a glass of milk or simply on their own.

Storage

To Store: Store cooled Brookies in a closed container at room temperature for 2-3 days. You can also store them in the fridge for 4-5 days.
To Freeze: You can freeze these bars in a freezer-safe container or zip loc bag for up to 3 months.

Peanut Butter Cookie Brownie Bars cut into squares

Frequently Asked Questions

Can cookie bars be frozen?

Yes, you can freeze these cookie bars. Make sure to cut the bars first and use wax or parchment paper in between layers so the bars won’t stick together. The bars will keep for up to 3 months. Thaw completely at room temperature or in the microwave.

Can I use refrigerated peanut butter cookie dough instead?

Yes, if you can’t find or prefer not to use the dry mix, you can use refrigerated peanut butter cookie dough instead. The package used in the recipe is equal to 12 peanut butter cookies.

how will I know when my brookies are done baking?

These bars are done baking when the cookie topping is puffy and golden at the edges. You can test the brownies for doneness by inserting a toothpick in the center. If it comes out clean, the brownies are ready.

how many servings does this recipe make?

This recipe makes 9 large squares or more smaller slices.

stacked Peanut Butter Cookie Brownie Bars

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4.34 from 3 votes