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Reese's Pieces Peanut Butter Bars

Reese's Pieces Peanut Butter Bars have so much peanut butter flavor and a thick layer of rich chocolate frosting. Reese's Pieces candies are sprinkled on top and added to the batter for lots of crunchy candy flavor. 
Course Dessert
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings 16 servings


  • 3/4 cup butter
  • 3 cups packed light brown sugar
  • 3/4 cup creamy peanut butter
  • 3 large eggs
  • 1 1/2 teaspoons vanilla extract
  • 3 3/4 cups all-purpose flour
  • 1 1/2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 3/4 teaspoon salt
  • 1 cup Reese's Pieces candies


  • 6 tablespoons butter, cut into pieces
  • 6 tablespoons milk
  • 1 1/2 cups granulated sugar
  • 1 cup semi-sweet chocolate chips
  • 1/4 teaspoon vanilla extract
  • 1/4 cup Reese's Pieces


  • Preheat oven to 350 degrees and grease a 9x13-inch baking pan.
  • In a saucepan over medium heat, melt butter and brown sugar. Stir until smooth.
  • Take saucepan off heat, stir in peanut butter until smooth. Let cool.
  • In a large bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
  • Once peanut butter mixture has cooled, whisk in eggs one at a time. Stir in vanilla. 
  • Add peanut butter mixture to dry ingredients, and stir until blended. 
  • Stir in Reese's Pieces and pour batter into prepared pan. Bake for 25 to 30 minutes or until set in middle and golden brown around edges.
  • Make frosting. Combine butter, milk, and sugar in a saucepan and bring to a boil. Cook at a rolling boil for 30 seconds.
  • Remove from heat and stir in chocolate chips and vanilla until smooth. Pour over warm bars.
  • Sprinkle Reese's Pieces on top.