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Chocolate Peanut Butter Brownies

close up shot of a bunch of Chocolate Peanut Butter Brownies stacked on top of each other
Stuffed with chewy Reese’s peanut butter cups, these homemade chocolate peanut butter brownies are soft, gooey, delicious, and might just make the perfect brownie.
Prep Time 20 mins
Chill Time 2 hrs 30 mins
Total Time 2 hrs 50 mins
Course Dessert
Cuisine American
Servings 12
Calories 231 kcal


  • ½ cup salted butter, melted and cooled
  • cups granulated sugar
  • 2 teaspoons vanilla extract
  • 3 large eggs
  • ¾ cup all-purpose flour
  • ½ cup unsweetened cocoa powder
  • ½ teaspoon salt
  • ½ teaspoon baking powder
  • 24 full-size chocolate peanut butter cups


  • Preheat the oven to 350°F.
  • Line a 9 x 13-inch rectangular baking pan with parchment paper and spray with nonstick cooking spray.
  • Beat together melted butter and sugar with a hand mixer or stand mixer.
  • Add vanilla extract and eggs, adding one egg at a time, beating well between each addition.
  • Sift together flour, cocoa powder, salt, and baking powder then add to the butter/sugar mixture.
  • Beat until fully combined.
  • Spread half of the batter across the bottom of the prepared baking pan. The batter will be thick in texture and will need to be spread carefully to cover the entire pan.
  • Nestle the chocolate peanut butter cups into the brownie batter, forming neat rows.
  • Spread the remaining batter over the peanut butter cups and smooth evenly.
  • Bake for 30 minutes. Batter should be set in the middle and a toothpick inserted in the center should come out with a few moist crumbs.
  • Remove from the oven and allow brownies to cool completely in the pan. 
  • Brownies will lift easily from the pan by lifting on the edges of the parchment paper lining.
  • Cut into pieces and serve!


  • Allow the parchment paper to overhang the edges of the pan a little. This will make it easier to remove the brownies when they’re done.
  • The batter will be thick in texture, so spread it carefully to cover the entire pan.
  • To check if the brownies are done, insert a toothpick in the center. It should come out clean with a few moist crumbs.


Calories: 231kcalCarbohydrates: 34gProtein: 3gFat: 10gSaturated Fat: 6gCholesterol: 67mgSodium: 191mgPotassium: 104mgFiber: 1gSugar: 26gVitamin A: 304IUCalcium: 24mgIron: 1mg