Three-Layer Chocolate Fudge Cake

Hot coffee in the batter deepens the chocolate flavor without tasting like coffee. The frosting is two ingredients. Those two facts explain why this three-layer chocolate fudge cake has become the birthday cake our readers make most. It is moist, dark and easy to frost, with a tender crumb that stays soft for days and a glossy ganache that spreads like a dream. You do not need a stand mixer, special pans or advanced decorating skills. You need two bowls, a whisk and an afternoon. The result is the kind of tall, dramatic cake that makes everyone at the party lean in when you carry it to the table.

Prep 30 min · Cook 30 min · Serves 12

Why coffee and buttermilk matter

Cocoa powder has a lot of flavor locked inside it, and hot liquid is the key that opens it up. When you pour hot coffee into the batter, it dissolves the cocoa and releases its deeper, roasted notes, a process bakers call blooming. Coffee and chocolate also share many of the same flavor compounds, so the coffee simply makes the cake taste more like chocolate. Even people who dislike coffee never notice it. If you prefer, you can use hot water instead; the cake will be a touch lighter in flavor but still delicious.

Buttermilk brings moisture and a slight tang that balances the sweetness. Its acidity also reacts with the baking soda to give the layers a gentle, even rise. Oil instead of butter keeps the crumb soft and moist, even straight from the refrigerator, which is why this cake tastes just as good on day three as it does on day one.

Ingredients

• 2 cups sugar
• 1 3/4 cups flour
• 3/4 cup cocoa powder
• 2 teaspoons baking soda
• 2 eggs
• 1 cup buttermilk
• 1 cup hot coffee
• 12 oz dark chocolate + 1 cup cream for the frosting

You will also need 1/2 cup neutral oil, such as vegetable or canola, plus a teaspoon of salt and, if you like, a teaspoon of vanilla extract. Use natural or Dutch-process cocoa; Dutch-process gives a darker color and a smoother, rounder flavor. For the ganache, choose a dark chocolate bar you enjoy eating, somewhere between 60 and 70 percent cacao, and chop it finely so it melts evenly. Bring the eggs and buttermilk to room temperature before you start so the batter mixes smoothly.

How to make it

1. Whisk the dry ingredients, then the eggs, buttermilk and 1/2 cup oil.
2. Stir in the hot coffee — the batter will be thin.
3. Divide among three pans and bake at 350°F for 25–30 minutes.
4. Pour hot cream over the chopped chocolate, stir and let thicken.
5. Stack and frost the cooled layers.

Preparing the pans

Use three 8-inch or 9-inch round cake pans. Grease them well, line the bottoms with circles of parchment paper, then grease the parchment and dust the pans with a spoonful of cocoa powder instead of flour so there is no white film on the dark cake. This takes a few extra minutes, but it guarantees the layers will release cleanly. If you only have two pans, bake two layers first and the third right after; the batter can wait at room temperature while the first batch bakes.

Do not panic about thin batter

Once the coffee goes in, the batter will look very thin, almost like chocolate milk. That is exactly right. A loose batter is what makes the finished cake so moist and tender. Pour it evenly into the pans, using a kitchen scale if you have one so the layers bake to the same height. Tap each pan firmly on the counter to release any large air bubbles.

Knowing when the layers are done

Start checking at 25 minutes. The cakes are ready when the tops spring back when lightly touched and a toothpick inserted in the center comes out with a few moist crumbs but no wet batter. Let them cool in the pans for 10 minutes, then run a thin knife around the edges and turn them out onto a wire rack. Peel off the parchment and let the layers cool completely before frosting, at least an hour.

Two-ingredient ganache frosting

Ganache sounds fancy, but it is simply chocolate and cream. Heat the cream in a small saucepan or the microwave until it just starts to simmer around the edges. Pour it over the finely chopped chocolate in a heatproof bowl, wait 5 minutes without stirring, then whisk slowly from the center outward until smooth and glossy. At this stage it is pourable, perfect for a drippy glaze. For a spreadable frosting, let it sit at room temperature for 1 to 2 hours, stirring now and then, until it is thick enough to hold soft peaks. To speed things up, refrigerate it, stirring every 10 minutes, but watch closely so it does not set too firm.

For a fluffier, lighter frosting, beat the cooled, thickened ganache with a hand mixer for 1 to 2 minutes. It will lighten in color and become almost mousse-like. Whipped ganache also goes further, which helps if you want a thick layer between each cake.

Make it your own

Bake the layers a day ahead and wrap them well — they are easier to frost cold.

Recipe tester Molly Grant

Molly’s make-ahead trick takes most of the stress out of a birthday. Wrap each cooled layer tightly in plastic wrap and refrigerate overnight. Cold cake is firmer, produces fewer crumbs and is much easier to stack straight. For a neat finish, spread a very thin first coat of ganache all over the cake to trap any crumbs, chill it for 20 minutes, then add the final, thicker layer. A few more ways to change things up:

• Raspberry: Spread a thin layer of seedless raspberry jam on each cake layer before the ganache.
• Salted caramel: Drizzle caramel sauce between the layers and sprinkle flaky salt on top.
• Peanut butter: Whisk 1/2 cup creamy peanut butter into the warm ganache.
• Mocha: Add a teaspoon of instant espresso powder to the cream as it heats.
• Sheet cake: Bake the batter in a 9-by-13-inch pan for 35 to 40 minutes for an easy party cake.

Decorating for a celebration

This cake looks beautiful with very little decoration. Swirl the top of the ganache with the back of a spoon for a rustic finish, or smooth the sides with an offset spatula for a cleaner look. Fresh berries piled in the center, chocolate shavings made with a vegetable peeler, or a scattering of colorful sprinkles all work well. For a child’s birthday, let the guest of honor help with the sprinkles. It never looks perfect, and it never needs to.

Slice with a long, sharp knife dipped in hot water and wiped dry between cuts. That simple step gives you clean, bakery-style slices that show off all three layers.

Storing and freezing

Because the frosting is ganache, the finished cake can sit at room temperature, covered, for up to 2 days. After that, refrigerate it for up to 5 days, and let slices sit out for 30 minutes before serving so the frosting softens and the crumb tastes its best. Unfrosted layers freeze beautifully for up to 3 months when wrapped in plastic and then foil. Thaw them overnight in the refrigerator, still wrapped, and they will be ready to frost.

Key takeaway: Hot coffee blooms the cocoa, oil keeps the layers moist and cold layers make frosting easy, so this cake rewards a little planning.

There is a reason this is the cake our community bakes for birthdays, anniversaries and just-because Fridays. It is reliable, rich without being heavy, and it looks like it took far more effort than it did. Save it to your recipe box, use the servings scaler to bake a smaller two-layer version, and if you want to learn piping and smooth finishes, check the schedule for our next weekend baking class.