Peanut butter chocolate cake combines three chocolate layers with a generous peanut butter buttercream, chopped candy between the layers, and a chocolate drip. It is a celebration cake with several components, so organize the ingredients and pans before starting.
This peanut butter chocolate cake uses three eight-inch round pans. The layers must cool completely before assembly. Trying to build the cake while they are warm can melt the frosting and make the stacked layers slide, even when the cake itself has baked properly.
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Why This Recipe Works
Oil and hot water keep the batter fluid, while natural cocoa gives the chocolate flavor. The batter is thinner than many butter-cake batters; that texture does not mean you should add unmeasured flour.
Peanut butter chocolate cake gets its structure from an evenly mixed batter and properly baked layers. A thin initial frosting coat traps loose crumbs, and a short chill makes the outer finish easier to spread. Ganache should remain fluid but lose its heat before touching the frosting.
Ingredients for Peanut Butter Chocolate Cake
Use natural unsweetened cocoa rather than assuming every cocoa type works identically with the leavening. Measure the baking soda and baking powder carefully. Grease the pans and line their bottoms so the cooled layers release cleanly.
For peanut butter chocolate cake frosting, choose a smooth, stabilized peanut butter that does not separate into oil and solids. The large powdered sugar quantity belongs to a generous covering and piping batch; simply removing several cups changes its consistency.
The decoration uses generic peanut butter cups. Six are chopped for the spaces between layers, and four are halved for the top, with extra crumbs if desired. Semisweet chocolate and heavy cream form the ganache; chocolate pieces should be small enough to melt evenly.
For the cake layers
- 1 3/4 cups all purpose flour
- 2 cups sugar
- 3/4 cup natural unsweetened cocoa powder
- 2 1/4 tsp baking soda
- 1/2 tsp baking powder
- 1 tsp salt
- 1 cup milk
- 1/2 cup vegetable oil
- 1 1/2 tsp vanilla extract
- 2 large eggs
- 1 cup hot water
For the frosting
- 2 cups unsalted butter, room temperature
- 1 1/4 cups peanut butter
- 9 cups powdered sugar
- 6-7 tbsp water or milk (Adjust for desired consistency.)
For the decoration
- 6 peanut butter cups, chopped
- 6 oz semi-sweet chocolate chips
- 1/2 cup heavy whipping cream
- 4 peanut butter cups, cut in half
- Crumble peanut butter cups
How to Make Peanut Butter Chocolate Cake
Whisk the cake’s dry ingredients together, then mix in milk, oil, vanilla, and eggs. Add the hot water gradually and combine until smooth. Divide evenly among the three prepared pans rather than guessing from their surface heights.
Bake at 350°F for about twenty-two to twenty-five minutes, checking for set tops and a center tester without wet batter. Let the layers settle briefly in their pans, then turn onto racks. Wait until the centers are completely cool before preparing the final assembly.
Beat the butter and peanut butter for the frosting, adding powdered sugar in portions and enough of the measured water or milk to make it spreadable. Stack peanut butter chocolate cake with frosting and half the chopped candy at each of the two internal seams. Cover the exterior first thinly, chill briefly, then apply the remaining finish.
Pour hot cream over the chopped semisweet chocolate, let it stand, and stir smooth. Wait until it is no longer hot, then spoon around the cake’s top edge for controlled drips. Finish with the halved candy and crumbs once the ganache begins to settle.
How to Serve
Cut peanut butter chocolate cake into twelve generous slices with a clean sharp knife. Wipe the blade between cuts to keep the candy and frosting layers distinct. Smaller slices are an option for a larger gathering, but the ingredient quantities still describe one complete cake.
Allow a refrigerated slice a short rest, about twenty to thirty minutes, for a softer frosting texture. Keep the rest of the cake cold until needed rather than repeatedly warming the entire cake.
Storage
Refrigerate peanut butter chocolate cake, covered, and use within three to four days. The cream-based ganache is a reason to keep leftovers chilled. Place it in a cake box or covered container that does not press against the decorations.
Freeze individual slices for about one month, wrapping after the frosting has firmed. Thaw in the refrigerator. The chocolate finish may show some condensation, so do not promise an identical freshly decorated appearance after freezing.
Adapted from Lindsay’s Peanut Butter Chocolate Layer Cake at Life, Love and Sugar; its ingredient proportions, three-pan baking arrangement, and candy placement informed this version. Instructions are newly written and brand-specific candy wording has been replaced. Use the FDA’s raw flour handling guidance.
Tips and Variations
If peanut butter chocolate cake layers dome, trim only after they are cool. Stable, level surfaces help the stack stay straight. Use a cake board or sturdy serving plate before filling so you do not have to move a delicate assembled cake.
Test one ganache drip first. If it runs all the way down, let the ganache cool a little longer; if it stops in a thick lump, stir and warm it very gently. Avoid pouring a hot bowlful directly over the buttercream.
Frequently Asked Questions
Can I bake peanut butter chocolate cake in two pans?
The listed bake time is for three eight-inch layers. Two deeper layers need different timing and sufficient pan capacity, so keep the specified arrangement for this method.
Where do the chopped candies go?
Divide the six chopped cups between the two internal filling layers. The four halved cups are reserved for decorating the top.
Can I frost warm layers?
No. Wait until the layers are cool throughout. Warmth softens the buttercream and can destabilize the stack.
Should ganache be hot when poured?
It should be fluid but no longer hot. Check one drip first to judge how quickly it travels down the chilled frosting.
Is natural peanut butter interchangeable?
An oily, separated peanut butter can make the frosting behave differently. Use a conventional smooth, stabilized product for this formulation.
More Recipes to Try
- Mini Chocolate Cake with Chocolate Frosting
- Classic Chocolate Cake
- Unbelievable Peanut Butter Pie
- Peanut Butter Brownies
Peanut Butter Chocolate Layer Cake
Ingredients
For the cake layers
- 1 3/4 cups all purpose flour
- 2 cups sugar
- 3/4 cup natural unsweetened cocoa powder
- 2 1/4 tsp baking soda
- 1/2 tsp baking powder
- 1 tsp salt
- 1 cup milk
- 1/2 cup vegetable oil
- 1 1/2 tsp vanilla extract
- 2 large eggs
- 1 cup hot water
For the frosting
- 2 cups unsalted butter, room temperature
- 1 1/4 cups peanut butter
- 9 cups powdered sugar
- 6-7 tbsp water or milk Adjust for desired consistency.
For the decoration
- 6 peanut butter cups, chopped
- 6 oz semi-sweet chocolate chips
- 1/2 cup heavy whipping cream
- 4 peanut butter cups, cut in half
- Crumble peanut butter cups
Instructions
- Heat oven to 350°F. Grease three 8-inch round pans and line their bases with parchment.
- Combine flour, sugar, cocoa, baking soda, baking powder, and salt. Mix in milk, oil, vanilla, and eggs; incorporate hot water slowly until the batter is uniform.
- Share batter equally among pans and bake 22–25 minutes, until centers are set and a tester has no wet batter. Stand in pans about 10 minutes, unmold, and cool fully on racks.
- Beat butter with peanut butter, then add powdered sugar in stages and 6–7 tablespoons water or milk as needed for a spreadable frosting.
- Stack the cooled layers with frosting and the 6 chopped candy cups, divided between the two filling seams. Apply a thin crumb coat and chill about 20 minutes; use remaining frosting to cover and pipe as desired.
- Heat cream until steaming and pour over chopped semisweet chocolate. Wait a minute, stir smooth, and cool until fluid but not hot. Add drips and a top coating, then decorate with the 4 halved candy cups and optional crumbs.
