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Chocolate Peanut Butter Cup Sheet Cake

This Chocolate Peanut Butter Cup Sheet Cake is a delightful combination of rich chocolate and creamy peanut butter, perfect for any occasion.
Prep Time15 minutes
Cook Time35 minutes
Total Time50 minutes
Course: Dessert
Cuisine: American
Keyword: Chocolate, Easy, Peanut Butter
Servings: 12 servings

Ingredients

Dry Ingredients

  • 4 tablespoons unsweetened cocoa powder
  • 2 cups all-purpose flour
  • ½ teaspoon salt
  • 1 teaspoon baking soda

Wet Ingredients

  • 1 cup water
  • 1.5 sticks margarine, softened
  • 2 cups granulated sugar
  • 2 large eggs
  • ½ cup buttermilk

Frosting Ingredients

  • 1 cup creamy peanut butter for frosting
  • 2 cups powdered sugar for frosting
  • 2 tablespoons milk for frosting
  • 1 teaspoon vanilla extract for frosting

Instructions

  • Step 1: Preheat your oven to 350°F (175°C).
  • Step 2: In a small saucepan, combine the cocoa powder and water. Bring to a boil over medium heat, stirring constantly. Remove from heat and set aside.
  • Step 3: In a large mixing bowl, cream together the softened margarine and granulated sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
  • Step 4: In another bowl, whisk together the flour, salt, and baking soda. Gradually add this mixture to the butter and sugar mixture, alternating with the buttermilk. Mix until just combined.
  • Step 5: Pour in the hot cocoa mixture, stirring gently until the batter is smooth.
  • Step 6: Pour the batter into a greased and floured sheet cake pan. Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean.
  • Step 7: Allow the cake to cool in the pan for 10-15 minutes, then transfer to a wire rack to cool completely.
  • Step 8: For the frosting, combine the peanut butter, powdered sugar, milk, and vanilla extract in a medium bowl. Mix until smooth. Adjust consistency with more milk if needed.
  • Step 9: Once the cake is cool, spread the peanut butter frosting evenly over the top.
  • Step 10: Cut into squares and serve!

Equipment

  • Mixing Bowl
  • Saucepan
  • Sheet Cake Pan
  • Wire Rack

Notes

Store leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week.