Mocha Layer Cake with Chocolate

Prep Time: 45 minutes
Cook Time: 30 minutes
Cooling and Assembly Time: 1 hour 15 minutes
Total Time: 2 hours 30 minutes
Difficulty Level: Intermediate
Servings: 12 slices

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Introduction

Looking to impress your guests or celebrate a special occasion with something luxurious? This Mocha Layer Cake with Chocolate-Rum Cream Filling combines the boldness of coffee, the richness of chocolate, and the subtle warmth of rum in a show-stopping dessert. The delicate balance of moist mocha sponge layers paired with silky chocolate-rum cream makes each bite an indulgent experience. This recipe is perfect for birthdays, dinner parties, or simply for when you’re in the mood to bake something extraordinary.

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Ingredients

For the Mocha Cake Layers:

• 2 cups (250g) all-purpose flour

• 1 ¾ cups (350g) granulated sugar

• ¾ cup (75g) unsweetened cocoa powder

• 1 ½ tsp baking soda

• 1 tsp baking powder

• ½ tsp salt

• 2 large eggs

• 1 cup (240ml) buttermilk

• ½ cup (120ml) vegetable oil

• 1 tsp pure vanilla extract

• 1 cup (240ml) hot freshly brewed coffee

• 1 tsp instant espresso powder (optional, for richer flavor)

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For the Chocolate-Rum Cream Filling:

• 1 ½ cups (360ml) heavy cream

• 200g (about 7 oz) semi-sweet or dark chocolate, finely chopped

• 2 tbsp unsalted butter

• 2 tbsp dark rum (or to taste)

• ½ tsp vanilla extract

• Pinch of salt

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For the Mocha Buttercream Frosting (Optional but Recommended):

• 1 cup (226g) unsalted butter, softened

• 3 ½ cups (420g) powdered sugar

• ¼ cup (25g) unsweetened cocoa powder

• 1 tbsp instant coffee granules dissolved in 2 tbsp hot water

• 1 tsp vanilla extract

• 2–3 tbsp milk or cream, as needed

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Equipment

• 2 or 3 round 8-inch cake pans

• Electric mixer or stand mixer

• Mixing bowls

• Whisk and spatula

• Cooling rack

• Offset spatula for frosting

• Cake turntable (optional but helpful)

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Instructions

Step 1: Prepare the Cake Pans

Preheat your oven to 350°F (175°C). Grease and flour your cake pans, or line them with parchment paper circles to prevent sticking.

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Step 2: Make the Mocha Cake Batter

1. In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt.

2. In another bowl, beat the eggs, buttermilk, oil, and vanilla until well combined.

3. Add the wet ingredients to the dry ingredients and stir until almost combined.

4. Dissolve the espresso powder in hot coffee. Slowly pour in the coffee mixture, stirring gently. The batter will be thin—this is normal.

5. Pour the batter evenly into the prepared pans. If using two pans, each should be about ⅔ full.

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Step 3: Bake the Cakes

Bake for 28–30 minutes, or until a toothpick inserted in the center comes out clean. Avoid overbaking to keep the layers moist.

Once baked, cool the cakes in the pans for 10 minutes, then turn them out onto a wire rack to cool completely.

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Step 4: Make the Chocolate-Rum Cream Filling

1. In a small saucepan, heat the cream just until it begins to simmer.

2. Remove from heat and pour it over the chopped chocolate and butter in a heatproof bowl.

3. Let sit for 1–2 minutes, then stir until smooth and glossy.

4. Add in the rum, vanilla, and a pinch of salt. Mix until fully incorporated.

5. Chill the mixture in the fridge for 45 minutes, or until it’s thick enough to spread but still smooth.

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Step 5: Make the Mocha Buttercream Frosting (Optional)

1. Beat the butter until pale and fluffy, about 3–4 minutes.

2. Add powdered sugar and cocoa powder gradually, mixing on low to prevent a sugar cloud.

3. Pour in the coffee mixture and vanilla extract.

4. Add milk or cream one tablespoon at a time until the frosting reaches your desired consistency—smooth and spreadable.

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Step 6: Assemble the Cake

1. If your cake layers are domed, level them using a serrated knife.

2. Place one layer on a cake board or serving plate.

3. Spread an even layer of the chocolate-rum cream filling on top.

4. Repeat with the remaining layers.

5. Once stacked, apply a thin crumb coat of frosting to seal in crumbs.

6. Chill the cake for 15–20 minutes, then frost the entire cake with the mocha buttercream.

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Step 7: Decoration (Optional but Fun)

• Use chocolate shavings, curls, or dust with cocoa powder.

• Pipe extra frosting around the edges.

• Garnish with coffee beans or a drizzle of chocolate ganache.

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Tips for Success

• Buttermilk Substitute: If you don’t have buttermilk, mix 1 cup of milk with 1 tbsp lemon juice or vinegar. Let it sit for 5–10 minutes before using.

• Rum Flavor: Want more of a rum kick? You can lightly brush each cake layer with a tablespoon of rum before spreading the filling.

• Non-Alcoholic Version: Replace rum with rum extract or omit it entirely.

• Storage: Store the cake in the fridge for up to 4 days. Let it sit at room temperature for 30 minutes before serving.

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Serving Suggestions

Serve this cake with a cup of strong coffee, espresso, or a small glass of dark rum. It’s a wonderful dessert for holidays, anniversaries, or any occasion that calls for a touch of elegance.

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Nutrition Information (Per Slice – Based on 12 Servings)

Note: Nutritional values are approximate and may vary depending on exact ingredients and brands used.

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Conclusion

This Mocha Layer Cake with Chocolate-Rum Cream Filling is a decadent fusion of flavors and textures that’s sure to impress. The rich chocolate layers, spiked with coffee and filled with a luxurious rum-spiked ganache, create a dessert that’s more than the sum of its parts. While it requires some time and patience, the result is worth every minute in the kitchen. Bake it for a loved one, or treat yourself—you deserve it.