Close up of a Peanut Butter Cup brownie with a bite taken out of it.

Peanut Butter Cup Brownies

Course Dessert/Bars
Cuisine American
Keyword Brownies, Peanut Butter, Peanut Butter Cups
Prep Time 15 minutes
Cook Time 25 minutes
Total Time 35 minutes



  • 1/2 cup butter
  • 1 bag (12 oz) semi-sweet chocolate chips
  • 1/2 cup brown sugar
  • 1/2 cup sugar
  • 3 eggs
  • 1 cup flour
  • pinch of salt
  • 30 miniature Reese's Peanut Butter Cups , chopped in half
  • Additional peanut butter cups for garnish , optional

Peanut Butter Frosting:

  • 4 tablespoons butter, softened
  • 4 tablespoons peanut butter
  • 1 1/2 to 1 3/4 cups powdered sugar, sifted
  • 2-3 tablespoons whipping cream (or milk is fine)
  • 1 teaspoon vanilla



  1. Preheat oven to 350 degrees. Line a 9x9 pan with foil and spray with nonstick cooking spray.
  2. In a large saucepan, melt the butter and chocolate chips on low heat, stirring frequently. Remove from heat and add sugar, stir until well combined. Add eggs, one at a time, stirring until well combined. Add flour and salt and mix until combined.

  3. Gently stir in chopped peanut butter cups. Pour evenly into prepared pan.

  4. Bake for 25-30 minutes or until toothpick comes out with just a few "brownie crumbs" on it. Cool completely and frost with peanut butter frosting.


  1. In a large mixing bowl, cream butter and peanut butter together until light and fluffy. Add powdered sugar, half-n-half and vanilla and beat until well combined.

Recipe Notes

Use the miniature peanut butter cups that come wrapped in foil, not the mini, mini ones that come already unwrapped in the bag.