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A close-up of a Reese’s peanut butter cup brownie with a bite taken out, revealing a fudgy brownie base with a whole peanut butter in the center, thick peanut butter frosting, and a drizzle of chocolate. Chopped peanut butter cups are scattered on top.
Recipe

Reese's Peanut Butter Cup Brownies

Servings: 15
Author: Jaclyn
Prep: 10 minutes
Cook: 30 minutes
Total: 40 minutes
Rich, fudgy brownies stuffed with Reese’s Cups and topped with a dreamy peanut butter frosting make these bars a must-try for any chocolate lover.

Equipment

Ingredients
 

For the brownies

  • 18 ounce box brownie mix plus ingredients called for on the box
  • 15 Reese's Peanut Butter Cups full-size

For the frosting

  • ¾ cup creamy peanut butter
  • ½ cup unsalted butter room temerature
  • 2 ¼ cups confectioners sugar
  • 4 Tablespoons heavy cream
  • 1 ½ teaspoons vanilla extract

Instructions

  • Preheat the oven to 350°F. Line a 9x13-inch baking dish with parchment paper and set aside.
  • Prepare the brownie mix according to the package instructions (likely with eggs, water, and oil). Spread about ⅔ of the batter evenly into the prepared baking dish.
  • Arrange 15 Reese’s Cups in a single layer over the batter, pressing them in slightly.
  • Gently spread the remaining brownie batter over the Reese’s Cups, ensuring they are fully covered.
  • Bake for 25-30 minutes, or until a toothpick inserted in the center comes out dry or with a few moist crumbs. If wet batter remains, bake a little longer.
  • Let the brownies cool completely on a wire rack before frosting.
  • In a large bowl, beat the peanut butter and softened butter with a hand or stand mixer until smooth. Gradually mix in the confectioners sugar, scraping the sides as needed. The mixture will be thick.
  • Add the heavy cream and vanilla and mix until combined. Increase to medium-high speed and whip for 2 minutes until light and fluffy.
  • Use the parchment paper to lift the brownies out of the pan. Spread the frosting evenly over the cooled brownies.
  • Slice and serve immediately, or top with chopped Reese’s and/or a chocolate drizzle for extra indulgence.

Notes

Store brownies in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 4 days. We prefer enjoying the brownies chilled so we keep them in the fridge from the start.

Nutrition

Calories: 530kcal | Carbohydrates: 60g | Protein: 7g | Fat: 31g | Saturated Fat: 11g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 7g | Trans Fat: 0.2g | Cholesterol: 48mg | Sodium: 245mg | Potassium: 138mg | Fiber: 1g | Sugar: 47g | Vitamin A: 257IU | Vitamin C: 0.1mg | Calcium: 24mg | Iron: 2mg
A close-up of a Reese’s peanut butter cup brownie with a bite taken out, revealing a fudgy brownie base with a whole peanut butter in the center, thick peanut butter frosting, and a drizzle of chocolate. Chopped peanut butter cups are scattered on top.

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