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Costco Chocolate Mousse Cake Copycat on white plate.
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5 from 1 vote

Chocolate Mousse Cake

This easy Chocolate Mousse Cake is s a rich and indulgent dessert. Creamy chocolate mousse is layered between layers of moist chocolate cake, for a delicious chocolate dessert cake.
Prep Time20 minutes
Cook Time25 minutes
Course: Dessert
Cuisine: American
Servings: 12
Calories: 717kcal

Equipment

Ingredients

  • 1 box Chocolate fudge cake mix 13.5 ounce
  • 3 Eggs
  • Butter the amount of oil the cake mix calls for
  • 1/4 cup Milk the amount of water the cake mix calls for

Mousse Filling

  • 3 cups heavy whipping cream
  • 1 5.9 oz box instant chocolate pudding mix

Frosting

  • 1 cup butter softened
  • 2 cups powdered sugar
  • 1 cup unsweetened cocoa powder
  • 1 teaspoon vanilla extract
  • ½ cup corn syrup
  • 4 cups semisweet chocolate chips

Instructions

Making the Chocolate Cake

  • Preheat your oven to 350 degrees.
  • In a large bowl add your cake mix.
  • Add the eggs your cake mix calls for plus one extra.
  • Instead of the oil the box mix calls for add that much melted butter.
  • Instead of the water the box mix calls for add milk.
  • Whisk your cake mix until combined.
  • Grease two 9 inch cake pans.
  • Pour ½ batter into each cake pan.
  • Bake for 20 minutes or until a toothpick inserted in the middle comes out clean.
  • Cool the cakes completely.

Chocolate Mousse Cake Filling

  • In a large bowl combine your heavy whipping cream with the dry instant pudding mix.
  • Using an electric mixer, beat until combined and fluffy.
  • Assemble your cake.
  • Place down one cooled cake layer.
  • Add all the mousse.
  • Top with the remaining cake layer.

Make the Chocolate Whipped Cream Frosting

  • In a microwave-safe bowl in 30 second intervals melt your chocolate chips with the corn syrup.
  • Set aside to cool but not harden.
  • Next in a large bowl using an electric mixer whip together the butter, powdered sugar, cocoa and vanilla.
  • Whip until soft peaks form.
  • Beat in the cooled chocolate mixture.
  • Frost the cake sides first, then the top.
  • Using a piping bag or plastic bag with the tip cut off and pipe around the edges.
  • Use a fork to make squiggly lines across the top.

Notes

Store leftovers in an airtight container in the refrigerator.

Nutrition

Calories: 717kcal | Carbohydrates: 70g | Protein: 9g | Fat: 47g | Saturated Fat: 28g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 13g | Trans Fat: 0.1g | Cholesterol: 115mg | Sodium: 73mg | Potassium: 557mg | Fiber: 7g | Sugar: 56g | Vitamin A: 1005IU | Vitamin C: 0.4mg | Calcium: 123mg | Iron: 5mg