Peanut Butter Chocolate Layer Cake

This Peanut Butter Chocolate Cake is made with layers of moist chocolate cake, peanut butter frosting, and chopped Reese’s peanut butter cups. It’s a chocolate peanut butter lover’s dream come true.

This peanut butter chocolate layer cake is a decadent dream. The layers are made from my popular Chocolate Sheet Cake recipe. It’s the moistest, fluffiest chocolate cake, plus it’s super easy to make. It goes perfectly with the creamy peanut butter frosting that divides the cake layers and and covers the cake. Not sold yet? I added chopped-up Reese’s peanut butter cups between each cake layer and topped the whole thing with a smooth, velvety chocolate ganache. It’s both beautiful and super tasty!

If you appreciate chocolate and peanut butter as much as I do, you are going to love this glorious layer cake. It’s quick and easy to make (so far as layer cakes go) and is just bursting with flavor. Grab a drop cloth and dive in.

Why You’ll Love This Reese’s Cake Recipe

This Reese’s cake recipe is every chocolate peanut butter lover’s dream. Here are just a few of the reasons you have to try it.

• Super moist. You’ll notice that the batter is very thin when you make it. All that liquid is what makes it so moist! It’s the perfect backbone for this scrumptious dessert.
• Wonderfully rich. Between the moist, fudgy chocolate cake, the Reese’s, and the buttercream frosting that’s absolutely bursting with peanut butter flavor, you are going to need a glass of cold milk to wash this one down. It’s so rich and delicious!
• Simple mixing method. The actual cake for this recipe is so easy to throw together. No fancy mixing methods. You basically just mix the dry ingredients, then the wet ingredients, and add them together with some hot water at the end.
• So many Reese’s. A chocolate peanut butter dessert isn’t complete without Reese’s, in my opinion. That’s why I loaded this cake with them. They’re chopped up and thrown in between the cake layers with the frosting and sprinkled all over the top.

What You’ll Need

Here’s what you’ll need to make this rich, decadent peanut butter chocolate cake. Scroll to the recipe card below for precise measurements.

Chocolate cake

• All-purpose flour – Be sure to measure your flour accurately so it doesn’t turn out dry. I recommend a food scale, but the spoon and level method also works.
• Sugar
• Natural unsweetened cocoa powder – You could use Dutch-processed cocoa powder instead for a richer chocolate flavor, the cakes just may not rise as much.
• Baking soda and baking powder – The combination of the two gives the best rise and texture.
• Salt – It may seem odd to add salt to a sweet dessert, but it actually brings out the flavors already naturally present. Without it, the cake will seem bland.
• Milk – Whole or 2% milk work great.
• Vegetable oil – The oil is part of what makes this cake so moist – and stay that way for days!
• Vanilla extract
• Eggs – Be sure to use large eggs, not medium or extra large.
• Hot water – The hot water really helps the chocolate bloom into full force.

Peanut butter frosting

• Butter – You’ll need butter for the frosting and it should be at room temperature, so that it’s able to be mixed properly.
• Peanut butter – Select a smooth peanut butter and steer clear of the natural stuff. It separates and is, as a result, nearly impossible to mix into the frosting.
• Powdered sugar – It may seem like a lot of powdered sugar, but keep in mind that the butter is also more. It’s a large volume batch of buttercream. I tend to use a lot to frost my cakes. If you think you’ll use less, don’t just reduce the powdered sugar – reduce everything by a similar percent.
• Water or milk – Water is more stable at room temperature, but milk is creamier. Heavy cream can also be used, but you’d use a little more.
• Reese’s – I use full sized Reeses.

Chocolate ganache and topping

• Semi-sweet chocolate chips – For the right consistency for the ganache, you’ll want to stick with semi-sweet chocolate.
• Heavy whipping cream
• Reese’s

How to Make Peanut Butter Chocolate Cake

Ready to make the best chocolate & peanut butter cake ever? Here’s a quick overview of how to do it. Scroll to the recipe card below for more thorough instructions.

For the chocolate cake layers

• Prep. Preheat oven to 350°F, line the bottom of three 8-inch cake pans with parchment paper, and spray the sides with non-stick baking spray.
• Combine the dry ingredients. Whisk together the flour, sugar, cocoa, baking soda, baking powder, and salt.
• Combine the wet ingredients. Whisk together the milk, vegetable oil, vanilla extract, and eggs.

• Put it all together. Mix together the wet and dry ingredients and slowly whisk in the hot water. The batter will be very thin.

• Bake. Divide the batter between the cake pans and bake for 22-25 minutes.
• Cool. Allow the cakes to cool in their pans for 2-3 minutes before transferring to a cooling rack.

Make the frosting and build the cake

• Make the frosting. Mix together the butter and peanut butter. Mix in half of the powdered sugar followed by 3 tablespoons water or milk. Mix in the remaining powdered sugar followed by more milk or water (add just enough to reach the desired consistency).
• Flatten the cakes. Use a large serrated knife to remove the tops of the cake layers.
• Layer. Place a cake layer on a serving plate and spread 1 cup of frosting over the top followed by half of the chopped Reese’s and a little bit more frosting. Stack the next cake layer on top followed by another cup of frosting, the rest of the Reese’s, and another smidge of frosting. Add the final cake layer to the top.
• Frost. Smooth the frosting on the sides of the cake to create a thin crumb coat. Frost the outside of the cake using my tutorial on how to frost a smooth cake. Reference the video in the recipe card to learn how to make the cool striped pattern in the frosting.

Make the ganache and decorate

• Make the ganache. Microwave the heavy whipping cream until it just begins to boil. Pour it over the chocolate chips and let it sit for a couple of minutes. Whisk until smooth.
• Decorate. Drizzle ganache around the edges of the cake then smooth some over the top of the cake. Let the ganache firm for 10 minutes before topping it with the remaining frosting and decorating with Reese’s

Tips for Success

• Don’t over-mix. When mixing the wet and dry ingredients together, avoid over-mixing as this can cause the glutens in the flour to overdevelop, leaving you with a dense cake.
• Cool completely. Allow the cake layers to cool completely before assembling the dessert. If the cakes are too warm, the frosting will melt off of them, leaving you with a mess.
• Room temperature butter. If the butter in the frosting is too cold, it won’t incorporate well with the other ingredients in the frosting, resulting in a lumpy buttercream.
• Choose your peanut butter wisely. Go for a smooth, creamy, no-stir peanut butter. Chunky or natural peanut butter will not mix smoothly into the frosting.
• Make it pretty. Cake stacking and frosting is an art. Luckily, you have the tools to learn how to do it. Check out my posts on how to level a cake, how to stack a cake, and how to frost a smooth cake to turn out the prettiest dessert possible.

Frequently Asked Questions

Why is my frosting not sticking to my cake?

It’s likely because the frosting is too thick. This can happen really easily with peanut butter buttercream. Add additional milk or water until you have your buttercream at the right consistency. If you tap your finger against the buttercream in the bowl, it should stick to your finger a bit. If it doesn’t stick at all, it’s likely too thick.

Can I make this chocolate & peanut butter cake in advance?

Sure! Go ahead and make the cake layers, allow them to cool, and store them in an air-tight container or wrap them well in plastic wrap until you are ready to assemble the cake (up to 2 days). They will be fine at room temperature. When the time comes, make the frosting and the ganache and put everything together. If you’d like to make the frosting ahead of time as well, you can. Seal it in an airtight container and store it in the fridge for up to 1 week. Bring it back to room temperature before using, as it’ll be very firm when cold.

Proper Storage

• Room temperature. Because of the chocolate ganache, I’d refrigerate the cake. But if you choose not to use it (and just frost the cake with buttercream), the cake can sit at room temperature for up to two days before being refrigerated.
• Refrigerator. Seal the cake in an airtight container or wrap it in a double layer of plastic wrap. I suggest that you use toothpicks to prop the plastic away any decorations to avoid smudging them. Alternatively, slice the cake and arrange the slices in a single layer in an airtight container. In either case, you can store the cake in the refrigerator for up to 4-5 days.
• Freezer. Allow the cake to firm up in the freezer for a couple of hours before wrapping it in a double layer of plastic wrap. If you already sliced the cake, arrange the slices in a single layer in an airtight container. Store the cake in the freezer for up to 3 months.
• To serve. This cake is meant to be enjoyed at room temperature. Allow it to thaw in the fridge (if applicable) before letting it sit at room temperature for a couple of hours before serving.

Watch How It’s Made

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