Ingredients
- Chocolate Cake Layers:
- 360 g warm coffee or hot water
- 360 g all-purpose flour
- 2 tablespoons cornstarch
- 300 g granulated sugar
- 150 g dark brown sugar
- 75 g unsweetened Dutch cocoa powder
- 1 ½ teaspoons baking powder
- 1 ½ teaspoons baking soda
- 1 ½ teaspoons salt
- 165 g vegetable oil
- 270 g sour cream, room temperature
- 3 large eggs, room temperature
- 3 teaspoons vanilla extract
- Chocolate Fudge Sauce:
- 50 g granulated sugar
- 25 g honey
- 60 g whole milk
- 100 g semi-sweet chocolate
- 10 g unsweetened Dutch cocoa powder
- 15 g unsalted butter
- 1 teaspoon vanilla extract
- Small pinch of salt
- Marshmallow Buttercream:
- 400 g unsalted butter, room temperature
- 225 g powdered sugar
- 200 g marshmallow fluff
- ½ teaspoon vanilla paste
- Small pinch of salt
Instructions
- Preheat oven to 170°C (340°F). Line three 20 cm (8-inch) round cake pans with parchment paper.
- In a large bowl, whisk together all dry cake ingredients.
- In another bowl, mix oil, sour cream, eggs, vanilla, and warm coffee. Gradually combine with dry ingredients until smooth.
- Divide batter evenly among pans. Bake 28–30 minutes, until a tester comes out clean. Cool completely on wire racks.
- To make fudge sauce: Heat sugar, honey, and milk in a saucepan until sugar dissolves and mixture bubbles. Pour over chocolate and cocoa powder, stir until smooth. Add butter, vanilla, and salt. Let cool.
- To make buttercream: Beat butter until fluffy. Add powdered sugar in two parts, then mix in marshmallow fluff, vanilla paste, and salt until smooth.
- Assemble cake: Level cake layers. Spread buttercream on the first layer, drizzle fudge sauce, then repeat for the second. Add the final layer, apply crumb coat, chill, then frost with remaining buttercream.
Notes
- Use hot water instead of coffee for a caffeine-free version.
- Chill assembled cake before final frosting for easier decorating.
- Add chocolate chips or flavored extracts for extra layers of flavor.
- Make cake layers a day ahead and store tightly wrapped.
- Let the cake sit at room temperature before serving for best texture.
- Prep Time: 1 hour
- Cook Time: 30 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Nutrition
- Serving Size: 1 slice
- Calories: 610
- Sugar: 48g
- Sodium: 390mg
- Fat: 36g
- Saturated Fat: 18g
- Unsaturated Fat: 16g
- Trans Fat: 0g
- Carbohydrates: 72g
- Fiber: 3g
- Protein: 6g
- Cholesterol: 95mg
