Peanut Butter Cake with Chocolate Ganache

Cut the cake layers first—chocolate, peanut butter frosting, chocolate ganache dripping down the sides. It’s 58 minutes total from mixing to a knife sliding through ganache that’s just set. Three layers. Two frostings. Looks like you spent the afternoon on it. Takes 35 minutes of prep, 23 in the oven, then some assembly, but nothing hard happens.

Why You’ll Love This Peanut Butter Cake

Chocolate and peanut butter together. Works every time. Feels fancy enough for a party but doesn’t need special equipment or skills. The chocolate cake is actually moist—coffee in the batter deepens the cocoa flavor without tasting like coffee. Peanut butter frosting is thick, spreadable, doesn’t need a pastry degree. Ganache on top makes it look like a bakery did it. Honestly sits in the fridge fine for a day or two if you make it ahead. Not complicated. Just tastes like you knew what you were doing.

Ingredients for Chocolate and Peanut Butter Cake

Cake flour. Not all-purpose. The starch ratio matters here. Cocoa powder—unsweetened, not sweetened. You’re controlling sweetness with sugar anyway. Baking powder and soda work together; skip one and it falls flat. Salt brings out chocolate. Three eggs, whole milk, canola oil, vanilla. Hot water dissolves instant coffee granules—just a teaspoon or two, enough to sharpen the chocolate flavor. Skip it if you hate coffee. Won’t hurt anything.

Unsalted butter cubed and soft. Temperature matters. Cold butter beats rough and grainy. Creamy peanut butter, smooth style—not chunky, not natural oil-separated kind. Powdered sugar sifted because lumps won’t break down. Heavy cream to loosen it. Vanilla again.

Ganache uses semi-sweet chocolate chopped fine—dark chocolate works if you want less sweet. Heavy cream and a tablespoon of butter. Optional Reese’s Pieces for texture and color on top.

How to Make Chocolate Peanut Butter Cake

Heat the oven to 355. Three 8-inch pans sprayed. Line bottoms with parchment if your oven runs uneven—heat distribution matters. Sift cake flour, cocoa, baking powder, baking soda, salt together in a medium bowl. Sifting isn’t optional here. Clumps kill the texture. You’ll feel the difference.

In a large bowl, whisk sugar, eggs, milk, oil, vanilla until it goes pale and frothy. This is where you get air into the batter. Don’t overbeat though—batter turns tough if you do. Add the dry stuff slowly, bit by bit. Whisk until just combined. Stop as soon as you can’t see flour streaks. Overworking toughens everything.

Dissolve coffee granules in very hot water separately. Stir into batter. Should be thin and pourable now, shiny looking. Not thick. Not gloppy. Use a kitchen scale if you have one—divide batter evenly, about 500 grams per pan. It matters. Tap pans gently on the counter to settle air bubbles.

Bake 23 to 28 minutes. Start checking at 20. Toothpick in the center should come out with a few moist crumbs, not wet batter. Edges smell nutty and dark. Cake shrinks slightly from the pan sides when it’s done. Cool 10 minutes in the pans. Flip onto wire racks. Loosely cover while cooling so the top doesn’t dry out and crust up.

How to Get the Frosting and Ganache Right

Beat softened butter on medium speed first. Light, airy, no lumps. Butter temperature actually matters—too cold and lumps won’t break down. Add creamy peanut butter, keep mixing until it’s smooth and silky. Add sifted powdered sugar in small additions on low speed. This prevents clouds of sugar everywhere. Gradually turn speed up to medium-high. Scrape the bowl edges constantly. Sugar and butter hide in corners.

Add vanilla and heavy cream. Beat 2 to 4 minutes until light and fluffy. Consistency should be thick but spreadable. Too stiff? Add cream one tablespoon at a time. Too loose? Add powdered sugar in half-cup increments. Taste it. Adjust salt if it needs it. Reserve a cup in a piping bag fitted with a decorative tip. Cover it so it doesn’t dry out.

For ganache, chop chocolate fine. Put it in a microwave-safe bowl with cream and butter. Microwave 1 minute on high. Let it sit 1 minute—don’t stir yet. Residual heat melts everything without seizing it. Whisk gently until silky and glossy. Cool on the counter until it thickens slightly but still pours. Too hot and it runs off. Too cold and it gets chunky. There’s a sweet spot.

Peanut Butter Cake Assembly and Tips

Place the first cooled cake layer on the serving plate. Trim the domed top with a serrated knife—level it so the stack doesn’t tilt. Spread about a cup of frosting on top, edge to edge with an offset spatula. Add the second layer, then frosting again. Third layer. Reserve 1 to 1.5 cups for a crumb coat and final coverage.

Crumb coat is optional but saves headaches. Thin layer all around, chill 15 minutes to set, then a thicker final coat. Looks neater that way. Pour ganache when it’s just cooled enough to pour but still glossy. Spoon it on the top. Tilt the cake to encourage drips down the sides. Use an offset spatula or bench scraper for an even coat.

Chill the cake for at least 1 hour before piping. Ganache firms beautifully cold. Pipe peanut butter frosting dollops around the edge with the reserved piping bag. Add Reese’s Pieces if you want crunch and color. Serve cold or let it sit 20 minutes at room temperature—cold slices cleaner, room temp tastes richer.

Keep it refrigerated if not serving soon. Lasts a couple days easy.

Peanut Butter Cake with Chocolate Ganache

By Emma

Prep:

35 min

Cook:

23 min

Total:

58 min

Servings:

12 servings

Ingredients

• Chocolate Cake
• 2 cups cake flour
• 3/4 cup unsweetened cocoa powder
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 3/4 cups granulated sugar
• 3 large eggs
• 1 cup whole milk
• 1/4 cup canola oil
• 2 teaspoons vanilla extract
• 3/4 cup very hot water
• 2 teaspoons instant coffee granules (can reduce or omit)
• Peanut Butter Frosting
• 1 cup unsalted butter, cubed and softened
• 3/4 cup creamy peanut butter (smooth style)
• 4 1/2 cups sifted powdered sugar (add more if needed)
• 6 tablespoons heavy cream (adjust for consistency)
• 1 teaspoon vanilla extract
• Chocolate Ganache
• 8 ounces semi-sweet chocolate, finely chopped (can substitute dark chocolate)
• 3/4 cup heavy cream
• 1 tablespoon unsalted butter
• Optional garnish: Reese's Pieces candies

Method

1. Chocolate Cake
2. 1 Heat oven to 355°F (adjusted). Spray 3 8-inch pans with baking spray; line bottom with parchment if uneven heat suspected.
3. 2 In medium bowl, sift cake flour, cocoa powder, baking powder, baking soda, salt. No skipping sift - clumps kill texture.
4. 3 In large bowl, whisk sugar, eggs, milk, oil, vanilla until pale, slight froth. Incorporate air here, don't overbeat.
5. 4 Add dry stuff to wet bit by bit. Whisk until just combined—don’t overwork or cake toughens.
6. 5 Dissolve coffee granules into hot water separately (coffee sharpens cocoa flavor; skip if sensitive). Stir into batter. Should be shiny and pourable, not thick-gloppy.
7. 6 Divide batter evenly – kitchen scale saves headaches here. About 500g each pan. Light taps on counter settle air bubbles.
8. 7 Bake 23-28 minutes. Start checking at 20. Toothpick in center should come out with few moist crumbs, not wet batter. Edges smell nutty chocolate, shrinking slightly from pan sides.
9. 8 Cool 10 minutes in pans. Gently flip onto wire racks. Cover loosely if drying during cool to avoid crust buildup.
10. Peanut Butter Frosting
11. 9 Beat butter first medium speed until light and airy, no lumps. Butter temp matters; too cold and lumps persist.
12. 10 Add peanut butter, continue mixing till combined smooth silk. Lumps here mean too cold or rushed.
13. 11 Slowly sifted powdered sugar goes in small additions first on low speed to prevent sugar clouds. Scale speed gradually to medium-high.
14. 12 Scrape bowl edges frequently. Frosting can catch stubborn pockets of sugar or butter. Don’t rush this step.
15. 13 Add vanilla and cream. Beat 2–4 mins to light fluffy texture. Frosting’s consistency should be thick but spreadable. Adjust powdered sugar by ½ cup increments to thicken or spoon heavy cream by tablespoon for thinning, scrapping after each add.
16. 14 Remove 1 cup frosting to a large piping bag fitted with decorative tip. Chill or keep covered till cake assembly to prevent drying.
17. Cake Assembly
18. 15 Place first cooled cake layer on serving plate. Level dome by trimming domed top cautiously with serrated knife to prevent uneven stacking.
19. 16 Spread about 1 cup frosting evenly top edge to edge with offset spatula.
20. 17 Add second layer, then more frosting. Repeat with third layer. Reserve about 1–1.5 cups frosting for crumb coat and final coverage.
21. 18 Crumb coat optional but recommended for tidy finish. Thin layer all around, chill 15 min to set, then thicker final coat.
22. Chocolate Ganache
23. 19 Put chopped chocolate, cream, butter in microwave-safe bowl.
24. 20 Microwave 1 minute on high. Rest 1 minute—residual heat crucial to melt chocolate without seizing.
25. 21 Whisk gently until ganache silky smooth; glossy sheen is golden sign.
26. 22 Cool ganache on counter until slightly thickened but pourable. If too hot, will run off cake too fast; too cold will be clumpy.
27. 23 Use large spoon to pour on top; tilt cake slightly to encourage drips down sides. Use offset spatula or bench scraper for thin, even coat on top and sides.
28. 24 Chill cake minimum 1 hour to firm ganache before piped decoration.
29. 25 Pipe peanut butter frosting dollops around edge with reserved piping bag.
30. 26 Add Reese's Pieces if desired for crunch, color pop. Serve chilled or room temp.
31. Storage and Serving
32. 27 Keep refrigerated if not serving soon. Ganache firms beautifully cold but soften 20 minutes before slicing for best texture.

Nutritional information

Calories

965

Protein

17g

Carbs

101g

Fat

60g

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Frequently Asked Questions About Chocolate Peanut Butter Cake

Can I make this chocolate peanut butter cake the day before? Yeah. Bake the layers, cool, wrap them. Make frosting and ganache the next day. Assemble and chill. Ganache stays glossy. Frosting doesn’t separate. Actually tastes better if you wait a day.

What if my frosting is too thick to spread? Add cream one tablespoon at a time. Let it sit 5 minutes between additions. Alternatively, warm the offset spatula under hot water, dry it, then spread—heat softens frosting just enough.

Can I use dark chocolate for the ganache instead of semi-sweet? Sure. Less sweet, more bitter. Works fine. Reese’s Pieces on top balance it if you go darker.

How do I know when the cake layers are actually done baking? Toothpick in the center with a few moist crumbs, not wet batter. Don’t pull it out looking for a clean one—that’s overbaked and dry. Also listen. The oven gets quiet when cake’s done baking.

Should I level the cake layers? Yeah. Domes make uneven stacking. Use a serrated knife and go slow. Or use a cake leveler if you have one. Matters more than you’d think.

Can I substitute chunky peanut butter? Not really. Spreads clumpy, doesn’t smooth into frosting right. Smooth peanut butter is what you need here.

How long do I need to chill the cake before serving? Minimum 1 hour so ganache sets. Overnight is fine. Slice better when cold anyway. Let it warm 20 minutes before eating if you want richer flavor.