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Elegant chocolate mousse cake topped with a shiny ganache layer, fresh berries, and mint, with a slice showing the layered mousse and cake.

Easy Homemade Chocolate Mousse Cake with Silky Ganache Topping

A decadent layered chocolate cake topped with creamy mousse and glossy ganache, finished with fresh berries and mint. Perfect for any special occasion or elegant dessert table.
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Prep Time 30 minutes
Cook Time 20 minutes
Chill Time 4 hours
Total Time 4 hours 50 minutes
Course Dessert
Cuisine international
Servings 12 slices
Calories 420 kcal

Ingredients
  

Chocolate Cake Layer

  • 1 cup 130g all-purpose flour
  • ½ cup 100g sugar
  • ¼ cup cocoa powder
  • 1 tsp baking powder
  • ½ tsp baking soda
  • ¼ tsp salt
  • 1 large egg
  • ½ cup milk
  • ¼ cup vegetable oil
  • ½ tsp vanilla extract
  • ½ cup hot water

Chocolate Mousse Layer

  • 1½ cups heavy whipping cream cold
  • 1 cup semi-sweet chocolate chips
  • 1 tsp vanilla extract

White Chocolate Layer (optional)

  • 1 cup white chocolate chips
  • 1 cup heavy cream

Ganache Topping

  • 1 cup heavy cream
  • 1 cup semi-sweet chocolate chips
  • 1 tbsp butter optional for shine

Decoration (Optional)

  • Blueberries raspberries, red currants
  • Mint leaves
  • Chocolate decorations

Instructions
 

Make the Chocolate Cake Base

  • Preheat oven to 350°F (180°C).
  • Mix flour, sugar, cocoa, baking powder, baking soda, and salt.
  • Add egg, milk, oil, and vanilla; mix until smooth.
  • Stir in hot water gently, pour into lined pan, bake 20–25 min.
  • Let cool completely.

Make the Chocolate Mousse

  • Melt chocolate chips gently.
  • Whip cold cream to soft peaks.
  • Fold in melted chocolate and vanilla.
  • Spread over cooled cake, refrigerate 30 min.

Make the White Chocolate Layer (Optional)

  • Heat cream until warm (not boiling).
  • Pour over white chocolate, stir until smooth.
  • Cool slightly, pour over mousse, chill 30 min.

Add Ganache Topping

  • Heat cream until steaming.
  • Pour over chocolate + butter, whisk until glossy.
  • Cool until slightly thick, pour over cake evenly.
  • Refrigerate at least 4 hours or overnight.

Decorate

  • Top with fresh berries, mint, and chocolate decorations before serving.

Notes

Tips

  • Use cold cream for mousse; warm cream won’t whip properly.
  • Chill each layer before adding the next for clean layers.
  • Run a warm knife around the cake ring for perfect edges.
 

Variations

  • Triple Chocolate: Add milk chocolate mousse layer.
  • Mocha Mousse Cake: Add 1 tsp espresso powder.
  • Raspberry Insert: Add a thin raspberry jelly layer between mousse and cake.
  • Mint Chocolate: Add a hint of peppermint extract.
 

Storage

  • Refrigerator: 4–5 days in airtight container
  • Freezer: Up to 2 months
  • Best served chilled for perfect slicing
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