Chocolate Peanut Butter Cup Sheet Cake Recipe

Indulge in this decadent Chocolate Peanut Butter Cup Sheet Cake! This crowd-pleasing recipe tastes exactly like your favorite candy bar – rich, chocolatey, and with a perfect peanut butter swirl. Perfect for potlucks, picnics, birthdays, or any occasion where you want to impress. This easy-to-make sheet cake is guaranteed to become a family favorite and a much-requested recipe at your next gathering. Get ready for rave reviews!

Prep Time 20 mins
Cook Time 40 mins
Calories 6930.6 kcal
Protein 171g
Rating 4.6 (5 Reviews)
Chocolate Peanut Butter Cup Sheet Cake 25

Recipe Actions

Share this recipe:

Recipe Author

Chef Forktionary, author of this recipe

Recipe adapted from Food.com. Standardized by Forktionary.

Ingredients for Chocolate Peanut Butter Cup Sheet Cake

Cook Smarter with Sous, Your Kitchen Companion

Missing an ingredient for this Chocolate Peanut Butter Cup Sheet Cake? Need a perfect wine pairing or a healthy side dish idea? Don't guess—ask Sous! Your AI-powered sous-chef is ready to help you swap ingredients, adjust serving sizes, and discover flavor tips in seconds.

How to Make Chocolate Peanut Butter Cup Sheet Cake

  1. Preheat oven to 350°F (175°C). Grease and flour a 10x15-inch jelly roll pan.
  2. In a large bowl, whisk together the dry ingredients: 2 cups all-purpose flour, 1 ½ cups granulated sugar, ¾ cup unsweetened cocoa powder, 1 ½ teaspoons baking powder, 1 teaspoon baking soda, ½ teaspoon salt.
  3. In a separate saucepan, bring to a boil: 1 cup water and ½ cup margarine.
  4. Pour the boiling water and margarine mixture over the dry ingredients. Add 2 large eggs, ½ cup buttermilk, and 1 teaspoon vanilla extract. Mix until just combined.
  5. Pour batter into the prepared pan and spread evenly.
  6. Bake for 25-30 minutes, or until a wooden skewer inserted into the center comes out clean.
  7. While the cake is still warm, prepare the frosting: In a medium bowl, combine ½ cup creamy peanut butter and 1 (16 ounce) can of milk chocolate frosting. Mix until smooth and well combined.
  8. Spread the peanut butter frosting evenly over the warm cake.
  9. Let the cake cool completely before cutting and serving. Enjoy!
  10. Store leftover cake in an airtight container at room temperature.

Nutrition Information (Approximate per serving)

Sodium

260 g

Sugar

2724g

Fat

370g

Carbs

308g