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.
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.
Why We Love This Brownie Peanut Butter Cookie Bars Recipe
- 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.
Other Easy Brownie Recipes
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
See Full Recipe Card Below
Jump to RecipeHow 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!
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.
Other Easy Peanut Butter & Chocolate Desserts
- Reese’s Peanut Butter Brownie Cupcakes
- Reese’s Cheesecake
- Buckeyes
- Reese’s Peanut Butter Cup Pie
- Buckeye Fudge
- Hershey’s Kisses Acorn Treats
- Homemade Peanut Butter Cups
- Peanut Butter Marshmallow Cups
Peanut Butter Brookies
Serves — 9
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.
Prep Time 5 minutes
Cook Time 30 minutes
Total Time 35 minutes
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)
Instructions
- Place parchment paper with high edges in a 7×11 casserole dish and preheat oven to 350F degrees.
- Start with making your peanut butter cookies in a medium to small bowl with the ingredients on the packet.
- Stir in ¼ cup of Reese’s pieces, reserving some to sprinkle later, and set aside.
- Following the brownie mix directions, make your brownie batter, and pour into a 7×11 dish. Note: you may need to spread around the batter to fit edge to edge.
- Lightly sink flattened cobblestone-like cookies into the brownie batter with the cookie dough.
- Add any additional Reese’s pieces to the exposed brownie parts, if desired.
- Bake for about 35-40 minutes, until the brownies come out clean but moist when a toothpick is inserted.
- Place 7×11 dish on a wire rack. Allow the cookie bars to fully cool before removing; this makes it easier to remove them from the dish and allows them to cut better.
- Serve on their own or with a glass of milk.
Jenn’s Notes
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.
- Allow the cookie bars to fully cool before removing; 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.
Nutrition Info
Calories: 319kcal | Carbohydrates: 53g | Protein: 4g | Fat: 10g | Saturated Fat: 3g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 3g | Trans Fat: 0.4g | Sodium: 326mg | Potassium: 19mg | Fiber: 1g | Sugar: 34g | Calcium: 4mg | Iron: 2mg
Is 7×11” pan correct? My pan is almost over flowing! Should it be 9×13” took way longer than the 35-40 min
send me recipes so I can make different kinds of desserts