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Ultimate 3-Layer Buckeye Brownies: Fudgy Base, Creamy Peanut Butter Center, and Glossy Chocolate Ganache

A close-up shot of a thick, three-layer buckeye brownies square held up, showing the brownie base, peanut butter layer, and chocolate topping.
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Make these rich Buckeye Brownies featuring a fudgy chocolate base, a thick, creamy peanut butter layer, and a smooth chocolate ganache topping. This recipe delivers the classic peanut butter and chocolate combination in a decadent bar form.

Ingredients

Scale
  • 1 box (about 18.25 ounces) brownie mix plus ingredients listed on box (eggs, oil, water)
  • 1 cup (2 sticks) unsalted butter, softened
  • 1 cup creamy peanut butter
  • 4 cups powdered sugar, sifted
  • 1 teaspoon vanilla extract
  • 1/4 cup milk
  • 1 1/2 cups semi-sweet chocolate chips
  • 2 tablespoons shortening or coconut oil

Instructions

  1. Prepare the brownie layer: Preheat your oven to the temperature specified on the brownie mix box. Grease and line a 9×13 inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
  2. Prepare the brownie batter according to the package directions. Spread the batter evenly into the prepared pan.
  3. Bake the brownie layer according to the package directions for a 9×13 pan, or until a toothpick inserted near the center comes out with moist crumbs attached. Let the brownies cool completely in the pan.
  4. Prepare the peanut butter layer: In a large bowl, beat the softened butter and peanut butter together until smooth.
  5. Gradually add the sifted powdered sugar, mixing on low speed until combined, then increase speed to medium and beat until fluffy.
  6. Add the vanilla extract and milk. Beat until the mixture is smooth and creamy.
  7. Spread the peanut butter mixture evenly over the cooled brownie layer. Place the pan in the refrigerator for at least 30 minutes to allow the peanut butter layer to set.
  8. Prepare the chocolate ganache topping: In a microwave-safe bowl, combine the chocolate chips and shortening (or coconut oil). Microwave in 30-second intervals, stirring well after each interval, until the chocolate is completely melted and smooth.
  9. Pour the melted chocolate mixture over the chilled peanut butter layer. Spread quickly and evenly to cover the entire surface.
  10. Return the pan to the refrigerator and chill for at least 1 hour, or until the chocolate topping is firm.
  11. Lift the brownies out of the pan using the parchment paper overhang. Cut into squares. Store leftovers in an airtight container in the refrigerator.

Notes

  • For a fudgier brownie, reduce the baking time by 2-3 minutes from what the box suggests.
  • If you prefer a slightly firmer peanut butter layer, reduce the milk added to the peanut butter mixture by half.
  • Use high-quality creamy peanut butter for the best texture in the middle layer.

Nutrition

Find it online: https://mdlatdmm.com/buckeye-brownies-recipe/