Ingredients:
- 2 cups (250g) all-purpose flour
- 2 cups (400g) granulated sugar
- 3/4 cup (75g) unsweetened cocoa powder
- 2 tsp (10g) baking soda
- 1 tsp (5g) baking powder
- 1 tsp (5g) salt
- 1 cup (240ml) buttermilk
- 1/2 cup (120ml) vegetable oil
- 2 large eggs
- 1 tsp (5ml) vanilla extract
- 1 cup (240ml) hot coffee
- 1 1/2 cups (150g) graham cracker crumbs
- 4 tbsp (56g) unsalted butter, melted
- 2 tbsp (25g) brown sugar
- 1/4 tsp (1.5g) salt
- 1 cup (225g) unsalted butter, softened
- 1 jar (225g) marshmallow fluff
- 3 cups (360g) powdered sugar
- 2 tsp (10ml) vanilla extract
- 2 tbsp (30ml) heavy cream
- 4 oz (115g) semi-sweet chocolate, chopped
- 1/2 cup (120ml) heavy cream
Instructions:
- Preheat oven to 350°F (175°C). Grease two 8-inch round cake pans with butter and line the bottoms with parchment paper.
- Whisk together flour, granulated sugar, cocoa powder, baking soda, baking powder, and salt in a large bowl.
- Add buttermilk, vegetable oil, eggs, and vanilla extract; beat on medium speed until the batter is smooth.
- Stir in the hot coffee by hand until combined. The batter will be thin.
- Divide batter evenly between the two pans and bake for 30-35 minutes, or until a toothpick inserted comes out with a few moist crumbs.
- Cool cakes completely on a wire rack.
- Prepare the crumble by mixing graham cracker crumbs, melted butter, brown sugar, and salt. Toast in a pan over medium heat until fragrant and crisp.
- Create the frosting by beating softened butter until creamy, then mixing in marshmallow fluff, powdered sugar, vanilla, and heavy cream until fluffy.
- Make the ganache by heating 1/2 cup heavy cream and pouring it over chopped semi-sweet chocolate; let sit, then stir until glossy.
- Assemble the cake by layering frosting and graham cracker crumble between the chocolate sponges.
- Frost the exterior and top of the cake. Pour the chocolate ganache over the edges for a drip effect.
- Chill the cake in the refrigerator for 2 hours to stabilize the structure.
- Use a kitchen torch or oven broiler to lightly char the marshmallow frosting peaks until toasted golden brown.