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5 from 1 vote

Chocolate Peanut Butter (Buckeye) Brownies

Chocolate Peanut Butter (Buckeye) Brownies are the ultimate brownie with a light, fluffy peanut butter layer and topped with chocolate-peanut butter ganache.
Prep Time25 mins
Cook Time25 mins
Total Time50 mins
Course: Dessert
Keyword: brownie, chocolate, chocolate and peanut butter
Servings: 24
Calories: 609kcal
Author: Jess Smith via Inquiring Chef
Cost: $4.00


  • 9 x 13 Baking Dish
  • Mixing Bowls
  • Stand or Handheld Mixer
  • Saucepan


Brownie Layer:

  • 1 cup Unsalted Butter
  • 2 cups Granulated Sugar
  • 3 Eggs
  • 3 teaspoons Pure Vanilla Extract
  • cup Unsweetened Cocoa Powder
  • ½ teaspoon Baking Powder
  • ½ teaspoon Salt
  • 1 cup All-Purpose Flour

Peanut Butter Layer:

  • 1 cup Butter, softened
  • 1 cup Creamy Peanut Butter
  • 4 cups Powdered Sugar
  • 2 Tablespoons Milk, if needed

Ganache Layer:

  • 4 cups Chocolate Chips
  • ½ cup Creamy Peanut Butter
  • ½ cup Butter
  • ½ cup Heavy Cream


  • Preheat oven to 350 F. Line a 9×13 pan with parchment paper (leave ends hanging over the edges so you can lift the brownies out after baking.)
  • For the brownies, melt the butter in a large saucepan. Remove from heat and whisk in sugar. Beat in eggs and vanilla until smooth. Add cocoa, baking powder and salt and stir to combine. Add flour and stir until smooth. Spread into pan and bake until cooked through, 25-30 min. Cool completely before frosting.
  • For peanut butter layer, beat all ingredients until light and fluffy. Add milk a bit at a time, if needed, to reach a smooth, spreadable consistency. Once the brownies are cool, spread the peanut butter layer over the top and refrigerate until set, about 30 minutes.
  • For the ganache layer, combine all ingredients in a microwave safe bowl. Melt slowly in 20 second increments in the microwave, stirring well each time. When smooth, pour over the top of the brownies and spread with a spatula until even. Return to the refrigerator to set. Slice and serve!


Calories: 609kcal | Carbohydrates: 66g | Protein: 8g | Fat: 37g | Saturated Fat: 20g | Trans Fat: 1g | Cholesterol: 83mg | Sodium: 257mg | Potassium: 175mg | Fiber: 3g | Sugar: 57g | Vitamin A: 763IU | Vitamin C: 1mg | Calcium: 63mg | Iron: 1mg