
Who doesn’t love the delightful combination of chocolate and peanut butter? This Chocolate Peanut Butter Cup Sheet Cake is the perfect blend of rich chocolate flavor complemented by the creamy texture of peanut butter. Whether you’re celebrating a special occasion or just treating yourself to something sweet, this sheet cake is sure to satisfy your cravings and impress your friends and family. With a simple list of ingredients and an easy-to-follow method, you’ll have this decadent cake ready to go in no time.
Why This Recipe Is a Must-Try
There are countless dessert recipes out there, but few can rival the sheer joy of a chocolate and peanut butter combination. This cake is not only delicious but also incredibly simple to make, making it a go-to recipe for both beginner bakers and seasoned pros. The creamy peanut butter topping is a showstopper, ensuring every bite is a delightful experience. Plus, it’s perfect for gatherings, parties, or a cozy night in. Let’s jump in and create a dessert that will leave everyone asking for seconds!
Ingredients
- 4 tablespoons unsweetened cocoa powder
- 1 cup water
- 1 ½ sticks margarine, softened
- 2 cups granulated sugar
- 2 cups all-purpose flour
- ½ teaspoon salt
- 1 teaspoon baking soda
- 2 large eggs
- ½ cup buttermilk
- 1 cup creamy peanut butter (for frosting)
- 2 cups powdered sugar (for frosting)
- 2 tablespoons milk (for frosting)
- 1 teaspoon vanilla extract (for frosting)
How To Make Chocolate Peanut Butter Cup Sheet Cake
Step 1: Preheat the Oven
Start by preheating your oven to 350°F (175°C). This will ensure that your cake bakes evenly and rises perfectly.
Step 2: Prepare the Cake Batter
In a small saucepan, combine the cocoa powder and water. Bring it to a boil over medium heat, stirring constantly. Once it boils, remove from heat and set aside.
In a large mixing bowl, cream together the softened margarine and granulated sugar until light and fluffy. This should take about 2-3 minutes. Next, add the eggs one at a time, mixing well after each addition.
Step 3: Incorporate Dry Ingredients
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. Be sure to mix until just combined.
Now pour in the hot cocoa mixture, stirring gently until the batter is smooth and well-combined.
Step 4: Bake the Cake
Pour the cake batter into a greased and floured sheet cake pan (a 12×17-inch pan works perfectly). Bake in the preheated oven for about 30-35 minutes or until a toothpick inserted into the center comes out clean.
Step 5: Cool the Cake
Once baked, remove the cake from the oven and allow it to cool in the pan for about 10-15 minutes. Then transfer it to a wire rack to cool completely.
Step 6: Make the Peanut Butter Frosting
While the cake cools, it’s time to prepare the luscious peanut butter frosting. In a medium bowl, combine the creamy peanut butter, powdered sugar, milk, and vanilla extract. Mix until the frosting is smooth and creamy. If the frosting is too thick, add a little more milk, one teaspoon at a time, until desired consistency is reached.
Step 7: Frost the Cake
Once the cake has cooled completely, spread the peanut butter frosting evenly over the top. You can make it as rustic or as smooth as you like, depending on your preference.
Step 8: Serve and Enjoy!
Cut the cake into squares and serve it up! This chocolate peanut butter cup sheet cake is perfect for any occasion, and the flavors will have everyone coming back for more.
Expert Tips
- For a richer chocolate flavor, try using a higher quality cocoa powder.
- Make sure the margarine is softened to room temperature to ensure a smooth batter.
- Don’t overmix the batter; mix only until the ingredients are combined.
- If you want a sweeter frosting, feel free to add more powdered sugar to taste.
Variations and Customizations
- Add some chocolate chips into the cake batter for an extra chocolaty surprise.
- Top the frosted cake with chopped peanuts or chocolate shavings for a decorative touch.
- Experiment with different nut butters like almond butter or cashew butter for the frosting.
- Drizzle some melted chocolate over the top of the frosting for a stunning presentation.
How to Store Leftovers
Leftover chocolate peanut butter cup sheet cake can be stored at room temperature in an airtight container for up to 3 days. If you want to keep it longer, you can refrigerate it for up to a week. The cake can also be frozen; just wrap it tightly with plastic wrap and place it in a freezer-safe container for up to 3 months. When ready to eat, simply thaw it in the refrigerator overnight.
FAQ
Can I use a different type of flour?
Yes! You can substitute all-purpose flour with a gluten-free flour blend or whole wheat flour, but note that this may change the texture slightly.
Is there a substitute for margarine?
You can substitute margarine with unsalted butter or a plant-based butter alternative if you prefer!
How can I make the frosting dairy-free?
To make the frosting dairy-free, use a dairy-free milk alternative, such as almond or oat milk, and opt for a dairy-free peanut butter.
Can I make this cake ahead of time?
Absolutely! You can bake the cake a day in advance. Just wait to frost it until you’re ready to serve to keep it fresh.
Conclusion
This Chocolate Peanut Butter Cup Sheet Cake is sure to become a favorite in your baking repertoire. With its rich flavors, wonderful texture, and easy preparation, it’s perfect for any occasion. Whether it’s a birthday celebration, a family gathering, or just a sweet treat for yourself, this cake will not disappoint. So gather your ingredients and get ready to whip up this delicious dessert that everyone will love. Enjoy every bite!

Chocolate Peanut Butter Cup Sheet Cake
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