1. Make the Chocolate Cake:

Preheat oven to 350°F (175°C). Grease and line two or three 8-inch (20 cm) round cake pans.

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

Add eggs, milk, oil, and vanilla. Mix until well combined.

Slowly pour in hot coffee or boiling water while mixing — batter will be thin.

Divide evenly between pans and bake for 30–35 minutes, or until a toothpick inserted comes out clean.

Cool cakes in pans for 10 minutes, then transfer to a wire rack to cool completely.

2. Make the Fudge Frosting:

In a large bowl, beat butter and cocoa powder until smooth.

Gradually add powdered sugar, alternating with cream. Beat until light and fluffy.

Stir in vanilla, salt, and melted chocolate (if using).

Adjust cream to reach a smooth, spreadable consistency.

3. Assemble the Cake:

Level cake layers if needed.

Place one layer on a serving plate or cake stand.

Spread a thick layer of fudge frosting. Repeat with remaining layers.

Frost the top and sides. Smooth with an offset spatula.

Optional: Decorate with chocolate curls, ganache drizzle, or chunks of fudge.