Keto Chocolate Mousse Cake (video)

keto chocolate mousse cake with keto whipped cream

Calling all keto dieters! This keto chocolate mousse cake with keto whipped cream will satisfy all your chocolate and dessert cravings while you’re on the keto diet! It’s made with almond flour chocolate sponge cake layers, chocolate custard mousse and topped with vanilla keto whipped cream, all sweetened with stevia or erythritol! This mousse cake is unbelievably light, fluffy and chocolatey and not too sweet! This keto dessert recipe is bound to become a favorite!

*NET CARBS ~ 71 grams for the entire cake! With 8 servings, there will be approximately 9 net carbs per slice.*

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Watch my YouTube video recipe for the step-by-step instructions and see make this mousse cake! Want to receive new recipe emails in your inbox? Make sure to subscribe to my website and my YouTube channel and turn on notifications!

Making the Keto Chocolate Sponge Cake

Getting lots of volume in a keto cake recipe can be a bit tricky since there is no regular flour or gluten. To get the most volume, I use lots of eggs and fine almond flour, which won’t weigh down the eggs. To get the best results, it’s important to whisk the eggs on high speed in a very clean mixing bowl for 7 to 9 minutes, until they are pale, thick and voluminous. When adding the dry ingredients, take care to add them in small batches and fold gently but thoroughly.

I also added a bit of oil to this sponge cake recipe, which isn’t included in most recipes. The oil makes the sponge cake extra rich, almost like a brownie! It’s the perfect complement to the light and fluffy mousse layers.

keto chocolate mousse cake sliced on plate

How to Make a Keto Chocolate Mousse Cake

I love chocolate mousse and this keto version is phenomenal! It’s everything you would want a regular chocolate mousse to taste and look like, but keto-friendly and low-carb! Every bite just melts in your mouth! It’s rich and chocolatey; light and fluffy; and the texture is spot on! This mousse with the chocolate cake makes the ultimate keto cake recipe!

  1. Prepare the keto chocolate base first and allow the cake to cool completely.
  2. For the mousse base, I make a simple chocolate custard. It’s important to let the custard cool completely before adding it to the whipped cream! Just cover the custard and place it into the refrigerator to cool. You can even make it a day ahead of time to save time.
  3. Once the chocolate custard is cooled, gently fold in the keto whipped cream, folding it in very gently so the mousse stays light and fluffy. This mousse is set with gelatin to ensure it keeps its shape.
  4. To assemble the cake, place one cake layer into the bottom of an 8-inch spring form pan lined with plastic or an acetate cake collar. Add half of the chocolate mousse and spread it evenly to the edges, then top with the second cake layer. Add the remaining chocolate mousse on top and spread evenly with an off-set spatula. Refrigerate the mousse cake for at least 6 hours, or overnight.
  5. Garnish the top of the cake with melted dark chocolate and dollops of keto whipped cream!
keto chocolate mousse cake recipe with stevia

More Keto Cake Recipes!

Enjoyed this keto cake and looking for more keto recipes? Check out some of my other recipes you’re sure to enjoy!

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Keto Chocolate Mousse Cake video recipe

Supplies/Tools

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Keto Chocolate Mousse Cake (video)

1 hr prep + 20 mins cook + 6 hrs Setting Time:
12 servings
Learn how to make a rich, chocolate KETO mousse cake! Extra light and fluffy and tastes just like a regular cake!

Ingredients 

For Chocolate Cake:

  • 6 large eggs
  • 1 cup granulated erythritol
  • 1 1/2 cups almond flour
  • 1/3 cup cocoa powder
  • 2 tsp baking powder
  • 1 tsp vanilla extract
  • 1 tsp coffee extract or emulsion
  • 1/2 cup vegetable, coconut or avocado oil

For Chocolate Mousse:

  • 3 egg yolks
  • 1/2 cup granulated stevia or erythritol
  • 1 tsp vanilla extract
  • 1 1/2 tbsp cocoa powder
  • 1 cup heavy cream
  • 1/2 cup unsweetened almond milk
  • 1 tbsp cornstarch or arrowroot powder
  • 2 cups heavy cream, chilled
  • 1/4 cup unsalted butter
  • 2 tsp unflavored gelatin
  • 2 tbsp water

For Keto Whipped Cream:

  • 1 cup heavy cream, chilled
  • 1/3 cup powdered stevia or erythritol
  • 1 tsp vanilla

Instructions

For the Keto Chocolate Cake:

  • Preheat the oven to 350F/177C. Line two, 8-inch (20-cm) cake pans with parchment paper; do not grease the sides.
  • Place the eggs into a stand mixer bowl and whisk on high speed for 7 to 9 minutes, until eggs are pale, thick and voluminous. In a separate bowl, combine the dry ingredients: almond flour, stevia, cocoa powder and baking powder. Sift the dry ingredients into the eggs in small increments, folding gently but thoroughly after each addition.
  • Add the vanilla, coffee and oil last. Fold the oil into the cake batter briefly, for about 30 seconds. Divide the cake batter evenly between the two pans and use an off-set spatula to spread the batter evenly to the edges. Bake the layers in the preheated oven for 20 to 22 minutes, until the center is set. Allow the cake layers to cool in the pans.

For the Keto Chocolate Mousse:

  • Meanwhile, prepare the chocolate custard. In a medium-sized bowl, combine the egg yolks, stevia, vanilla and cocoa powder. Whisk for a minute until a smooth paste forms. Begin adding the heavy cream and whisk until the mixture is smooth. In a separate measuring cup, whisk the corn starch into the almond milk, then pour the almond milk into the custard mixture.
  • Pour the custard mixture into a sauce pan and cook over medium-low heat, stirring constantly with a rubber spatula, for 4 to 5 minutes. The custard needs to thicken and hold its shape on the back of a spoon. Remove the custard from heat and add the butter. Whisk until the butter is completely melted, then cover the custard and place into the refrigerator to cool completely.

Making the Whipped Cream:

  • Once the custard and the cake layers are completely cooled, prepare the mousse. Pour the 2 cups (475 ml) chilled heavy cream into a mixer bowl and whisk on high speed for 3 to 4 minutes until stiff peaks form. In a small ramekin, combine the water and gelatin and whisk until smooth. Microwave the gelatin mixture for 30 to 45 seconds, stirring occasionally, until the gelatin is completely dissolved. Do not wait for the gelatin to cool; add it immediately into the whipped cream; whisk on high speed for 30 seconds.
  • Add about 1 cup of the whipped cream into the cooled custard and fold gently. Then, add the custard to the whipped cream. Fold gently but thoroughly, until the mixture is smooth and even.

Assembling the Mousse Cake:

  • To assemble the cake, place one cake layer into the bottom of an 8-inch spring form pan lined with plastic or an acetate cake collar. Add half of the chocolate mousse and spread it evenly to the edges, then top with the second cake layer. Add the remaining chocolate mousse on top and spread evenly with an off-set spatula. Refrigerate the mousse cake for at least 6 hours, or overnight.
  • For the keto whipped cream, combine the cream, stevia and vanilla in a mixer bowl. Whisk on high speed for 3 to 4 minutes until stiff peaks form. Transfer the whipped cream into a pastry bag tipped with a star tip; I used Ateco tip #847.
  • Release the spring form pan and transfer the cake onto a stand. Garnish with a drizzle of melted dark chocolate and keto whipped cream. Keep cake refrigerated until ready to serve.

Nutrition

Calories: 529kcal | Carbohydrates: 10g | Protein: 9g | Fat: 53g | Saturated Fat: 24g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 17g | Trans Fat: 1g | Cholesterol: 250mg | Sodium: 150mg | Potassium: 144mg | Fiber: 3g | Sugar: 1g | Vitamin A: 1468IU | Vitamin C: 1mg | Calcium: 156mg | Iron: 2mg