Decadent Chocolate Layer Cake

This decadent chocolate layer cake has three thin, tender layers filled with silky chocolate frosting and topped with a glossy chocolate ganache. The secret is using both cocoa powder and melted chocolate in the batter, which gives deep flavor and a moist crumb that stays tender for days.

Ingredients for Decadent Chocolate Layer Cake

All-purpose flour provides structure without making the cake tough. Cocoa powder and melted chocolate build rich chocolate flavor throughout. Baking soda and baking powder create lift, while salt balances sweetness. Butter and sugar cream together to trap air and give the cake a tender crumb. Eggs at room temperature emulsify the batter and add moisture. Vanilla extract deepens the chocolate taste. Hot water blooms the cocoa and chocolate, intensifying flavor. For the frosting, butter must be soft to blend smoothly with powdered sugar and cocoa powder, creating a spreadable consistency. Heavy cream and chocolate make the ganache glossy and pourable.

Why This Decadent Chocolate Layer Cake Works

Creaming room-temperature butter and sugar together incorporates air that expands in the oven, making the cake light and fluffy. Adding eggs one at a time lets each one fully blend into the batter instead of curdling it, which keeps the texture smooth and moist.

Hot water stirred into the cocoa powder and melted chocolate blooms the cocoa solids, releasing their full flavor and darkening the batter. This step is what makes the cake taste deeply chocolatey instead of flat. The batter will be thin, almost like brownie batter, but bakes into a tender cake because the flour structure sets as it cooks.

Cooling the cake layers completely before frosting prevents the frosting from sliding off or melting. The ganache poured over the top sets slightly as it cools, giving a smooth, shiny finish that looks professional.

Mistakes To Avoid

Overmixing the batter after adding flour develops gluten and makes the cake tough and dense. Stir just until the flour streaks disappear, then stop. A few lumps are fine and will bake out.

Using cold or slightly warm ganache causes it to thicken and become lumpy instead of pouring smoothly over the cake. Let it cool to about 95°F (35°C) so it flows evenly but sets as it cools.

Frosting the cake layers while they are still warm melts the frosting and causes it to soak into the cake instead of staying on top. Wrap cooled layers in plastic wrap and let them sit at room temperature for at least one hour, or refrigerate for up to one day, before assembling.

Stacking layers without a crumb coat leaves loose crumbs in the frosting, making it look messy. Spread a thin layer of frosting on each cake layer first, chill for 15 minutes, then add the final frosting layer.

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Ingredients

• 1 3/4 cups (220 grams) all-purpose flour
• 3/4 cup (65 grams) unsweetened cocoa powder
• 1 3/4 teaspoons baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 6 ounces semi-sweet or dark chocolate, chopped
• 1/2 cup (115 grams) unsalted butter, softened
• 1 1/2 cups (300 grams) granulated sugar
• 3 large eggs, room temperature
• 1 teaspoon vanilla extract
• 3/4 cup hot water
• 1 cup (230 grams) unsalted butter, softened, for frosting
• 2 cups (240 grams) powdered sugar
• 1/2 cup (45 grams) unsweetened cocoa powder, for frosting
• 1/4 cup heavy cream
• 6 ounces semi-sweet or dark chocolate, chopped, for ganache
• 2 tablespoons heavy cream, for ganache

Step-by-step Instructions

1. Preheat the oven to 350°F (175°C). Butter and flour two 9-inch round cake pans, or line the bottoms with parchment paper.
2. Whisk together flour, 3/4 cup cocoa powder, baking soda, baking powder, and salt in a small bowl. Set aside.
3. Chop 6 ounces chocolate and place in a medium bowl. Pour 3/4 cup hot water over it and let sit for 1 minute, then stir until smooth. Let cool slightly.
4. In a large bowl, beat 1/2 cup softened butter and 1 1/2 cups sugar with an electric mixer on medium-high speed for 3 to 4 minutes, until pale and fluffy.
5. Add eggs one at a time, beating well after each addition until fully blended. Add vanilla extract and beat for 30 seconds.
6. Pour the cooled chocolate mixture into the batter and stir on low speed until just combined, about 30 seconds. Do not overmix.
7. Add the flour mixture in two batches, stirring on low speed after each addition just until the flour streaks disappear. The batter will be thin.
8. Divide batter evenly between the prepared pans. Bake at 350°F (175°C) for 30 to 35 minutes, until a wooden pick inserted in the center comes out with a few moist crumbs and the top springs back when lightly touched. Do not overbake.
9. Cool the cakes in the pans for 10 minutes, then turn out onto a wire rack and cool completely, at least 1 hour, before frosting.
10. For the frosting, beat 1 cup softened butter, 2 cups powdered sugar, and 1/2 cup cocoa powder on medium speed for 2 to 3 minutes, until smooth and fluffy. Add 1/4 cup heavy cream and beat until spreadable. Add more cream if needed, 1 tablespoon at a time.
11. Place the first cooled cake layer on a serving plate. Spread a thin frosting layer on top, then place the second cake layer on top and repeat with the third layer. Frost the sides and top with the remaining frosting.
12. For the ganache, place 6 ounces chopped chocolate in a small bowl. Heat 2 tablespoons heavy cream in a small saucepan over low heat until steaming, then pour over the chocolate. Let sit for 1 minute, then stir until smooth and glossy. Cool to about 95°F (35°C), then pour over the top of the frosted cake, letting it drip down the sides.
13. Refrigerate the cake for at least 30 minutes before slicing to set the ganache and frosting.