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peanut butter brookies cut into squares on parchment paper

Peanut Butter Brookies

Peanut Butter Brookies are the best of everything. They are the fudgy, chocolatey goodness of your favorite brownies, combined with a crunchy peanut butter cookie topping.
5 from 1 vote
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Course Cookies, Dessert
Cuisine American
Servings 16
Calories 276 kcal


Peanut Butter Cookies

  • ½ cup unsalted butter, softened to room temp
  • cup white sugar
  • cup light brown sugar
  • 1 large egg
  • ¾ cup creamy peanut butter
  • 1 teaspoon vanilla extract
  • 1 ¼ cups all-purpose flour
  • ½ teaspoon baking soda
  • ¼ teaspoon salt
  • ¼ cup chocolate chips, optional


  • 1 box brownie mix, 18 ounces
  • 2 eggs, large
  • ½ cup vegetable oil
  • ¼ cup water


  • Preheat the oven to 350 degrees.
  • Line a 9x13 baking dish with parchment paper, or lightly spray with cooking spray and set aside.
  • To make the peanut butter cookie dough: Add softened butter, white sugar and light brown sugar to a medium mixing bowl.
  • Cream butter and sugar together on low until fluffy.
  • Add one egg, creamy peanut butter and vanilla extract, and beat together.
  • Mix together the dry ingredients in a separate bowl.
  • Add dry ingredients to wet mixture, and combine well. Set aside.
  • To make brownie batter: Combine brownie mix with eggs, oil, and water
  • Mix until well combined.
  • To assemble: Add brownie batter to the prepared baking dish.
  • Spoon peanut butter cookie dough over brownie batter
  • Sprinkle with chocolate chips if desired.
  • Press down a bit if the cookie dough is crumbly to get a more cohesive bar. It’s okay if it sinks into the brownie batter a bit.
  • Bake at 350.
  • After 30 minutes, test the center of your brookie bars for doneness with a fork or toothpick. If the brownie underneath seems too gooey for your liking, bake another 5 minutes, then test again.
  • Once brookie bars have reached desired doneness, remove from the oven and let cool in the pan for 15 minutes or so before slicing and serving.



  • Parchment paper works well for these brookies, but you can also just spray your pan with baking release spray. 
  • Drizzle with melted peanut butter or chocolate sauce!
  • Double or triple the recipe using the 1x2x3x tab in the printable recipe card.


Calories: 276kcalCarbohydrates: 20gProtein: 5gFat: 20gSaturated Fat: 6gPolyunsaturated Fat: 4gMonounsaturated Fat: 9gTrans Fat: 0.3gCholesterol: 46mgSodium: 137mgPotassium: 98mgFiber: 1gSugar: 11gVitamin A: 222IUCalcium: 18mgIron: 1mg
Keyword peanut butter brookies
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