Indulge Guilt-Free with this Low-Carb Chocolate Mousse Cake Recipe for Keto Dieters

Indulge in Decadence with Low-Carb Chocolate Mousse Cake

Imagine a dessert that not only satisfies your deepest chocolate cravings but also aligns with your keto lifestyle. The Low-Carb Chocolate Mousse Cake is a dream come true for anyone on a ketogenic diet who desires the indulgence of a rich, velvety dessert without the guilt. This cake is not just a treat for your taste buds; it’s a masterpiece of culinary finesse that fits perfectly into a low-carb regimen. With its airy mousse and moist cake base, this dessert proves that you can have your cake and eat it too, even on keto.

Whether you’re celebrating a special occasion or simply treating yourself, this chocolate mousse cake is the perfect addition to your low-carb recipe collection. It’s sugar-free, gluten-free, and brimming with the kind of luxurious chocolate flavor that you might have thought was off-limits. But fear not, this cake is here to ensure that you can enjoy the finer things in life while staying true to your dietary goals.

Low-Carb Chocolate Mousse Cake

The Essence of Keto Desserts

The Low-Carb Chocolate Mousse Cake is more than just a dessert; it’s a testament to how the keto diet can be both delicious and diverse. Born from the need to create a dessert that could be enjoyed without disrupting ketosis, this cake is a harmonious blend of nutrient-rich ingredients and chocolate decadence. Almond flour and coconut flour provide a low-carb base, rich in fiber and healthy fats, while unsweetened cocoa powder delivers that deep chocolate flavor without the added sugars.

Every ingredient in this cake has been carefully selected to ensure it meets the keto criteria. The use of erythritol, a sugar alcohol, gives the sweetness you crave without the high-carb consequences. Heavy whipping cream and butter add the necessary fats to keep you satiated and in ketosis. This cake isn’t just good for a keto dessert; it’s a good dessert, full stop. It’s a celebration of how far low-carb cooking has come, allowing us to enjoy what we love without compromise.

The benefits of these key ingredients extend beyond their low-carb properties. Almond flour, for instance, is not only low in carbs but also high in vitamin E and magnesium, essential nutrients for a healthy body. The heavy whipping cream is not just a source of fat; it’s also rich in vitamins A and D, as well as calcium. This cake is a powerhouse of nutrients disguised as a decadent dessert, making it a guilt-free pleasure for those on the keto diet.

Mixing Ingredients for Chocolate Mousse Cake

Perfecting the Method

Creating the perfect Low-Carb Chocolate Mousse Cake is an art that involves precision and patience. When preparing the cake base, ensure that your eggs are at room temperature to achieve a smoother batter. This aids in creating a more uniform texture in the cake, which is crucial for a delicate dessert like this. The melted butter should be cooled slightly before adding to the eggs to prevent cooking them prematurely.

As for the mousse, the key to that light, airy texture lies in the whipping process. Beat the heavy cream until it just begins to thicken before adding the erythritol and cocoa powder. This gradual process helps to incorporate air and build structure. The addition of xanthan gum is a clever trick to stabilize the mousse, ensuring it holds its shape atop the cake. Be cautious not to overbeat, as this can cause the mousse to become grainy.

When assembling the cake, patience is your friend. Allow the cake to cool completely before adding the mousse; otherwise, the heat will cause the mousse to melt and lose its fluffy texture. Spread the mousse gently with a spatula to avoid deflating the air you’ve so carefully incorporated. This attention to detail will result in a dessert that’s as beautiful as it is delicious.

Low-Carb Chocolate Mousse Cake Assembly

Variations to Savor

Mint Chocolate Mousse Cake

For a refreshing twist, infuse your mousse with a hint of mint. Add a few drops of mint extract to the mousse mixture for a cool, invigorating flavor that complements the chocolate beautifully. Top with fresh mint leaves for an elegant presentation and an extra pop of flavor.

Espresso Chocolate Mousse Cake

Coffee lovers can rejoice by adding a shot of espresso or a teaspoon of instant coffee powder to the cake batter. The espresso will intensify the chocolate flavor and add a subtle coffee note that elevates the overall taste experience.

Berry Bliss Chocolate Mousse Cake

For a fruity flair, serve your cake with a berry compote on the side. The natural sweetness and slight acidity of berries like raspberries or strawberries cut through the richness of the chocolate, offering a delightful contrast in flavors.

Substitutions for Every Preference

While this cake is designed to be keto-friendly, some may have dietary preferences or restrictions that require substitutions. Here are a few alternatives to keep your cake low-carb and suitable for your needs:

Coconut Cream for Heavy Whipping Cream: For those avoiding dairy, coconut cream can be a fantastic alternative to heavy whipping cream in the mousse. It offers a similar fat content and can be whipped to a comparable consistency, with the added bonus of a subtle coconut flavor.

Coconut Oil for Butter: If you’re dairy-free or prefer the taste of coconut, using coconut oil instead of butter in the cake base can be a great option. It still provides the necessary fat content and lends a light coconut aroma that pairs well with chocolate.

Monk Fruit Sweetener for Erythritol: If erythritol isn’t your preferred sweetener, monk fruit sweetener is an excellent alternative. It’s natural, low in carbs, and has a sweetness level close to that of sugar, making it an easy one-to-one substitution.

Frequently Asked Questions

Can I make this cake nut-free? Yes, you can substitute sunflower seed flour or pumpkin seed flour for almond flour to make a nut-free version. Keep in mind that the texture and flavor may vary slightly.

Is this cake freezer-friendly? Absolutely! You can freeze the cake base and mousse separately. Thaw in the refrigerator before assembling and serving.

How can I ensure the mousse sets properly? Make sure to use xanthan gum as instructed, and chill the cake for at least 1 hour before serving. This will help the mousse hold its shape.

Can I use a different sweetener? Yes, you can use any granulated or powdered sweetener that measures like sugar. Be aware that the sweetness level and carb count may vary.

What can I do if my mousse isn’t thickening? Ensure that your heavy whipping cream is very cold before beating, and add the xanthan gum as a stabilizer. If it’s still not thickening, place the mixture in the refrigerator for a few minutes before whipping again.

Low-Carb Chocolate Mousse Cake

A decadent and luxurious chocolate mousse cake that's low in carbs and keto-friendly. This silky smooth dessert combines rich chocolate flavors with a light, airy texture, making it the perfect indulgence for anyone following a low-carb lifestyle.
No ratings yet
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Course Desserts
Cuisine American
Servings 8 people
Calories 350 kcal


  • 8-inch (20cm) round cake pan
  • Parchment paper
  • Mixing bowls
  • Electric mixer
  • Measuring cups and spoons
  • Whisk
  • Spatula


For the Cake:

  • 1 cup almond flour 96g
  • cup coconut flour 40g
  • ½ cup unsweetened cocoa powder 50g
  • ¾ cup granulated erythritol 144g
  • 1 tsp baking powder 4g
  • ½ tsp salt 2g
  • 4 large eggs room temperature
  • ½ cup unsalted butter melted, 113g
  • 1 tsp vanilla extract 5ml

For the Mousse:

  • 1 ½ cups heavy whipping cream 360ml
  • ½ cup powdered erythritol 96g
  • cup unsweetened cocoa powder 30g
  • 1 tsp vanilla extract 5ml
  • ½ tsp xanthan gum 1g


  • Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
  • Prepare the Cake Pan: Line an 8-inch (20cm) round cake pan with parchment paper and grease the sides.
  • Mix Dry Ingredients: In a large mixing bowl, whisk together almond flour, coconut flour, unsweetened cocoa powder, granulated erythritol, baking powder, and salt.
  • Add Wet Ingredients: In a separate bowl, beat the eggs, then mix in the melted butter and vanilla extract. Combine the wet ingredients with the dry ingredients, stirring until you have a smooth batter.
  • Bake the Cake: Pour the batter into the prepared cake pan and smooth the top with a spatula. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Allow the cake to cool completely in the pan.
  • Make the Mousse: While the cake is cooling, prepare the mousse. In a large bowl, beat the heavy whipping cream until it starts to thicken. Gradually add powdered erythritol, unsweetened cocoa powder, vanilla extract, and xanthan gum. Continue to beat until the mixture is thick and holds stiff peaks.
  • Assemble the Cake: Once the cake has cooled, remove it from the pan and place it on a serving plate. Spread the chocolate mousse over the top of the cake, creating a smooth layer.
  • Chill: Refrigerate the cake for at least 1 hour to set the mousse before serving.


For a dairy-free version, substitute the heavy whipping cream with coconut cream and use coconut oil in place of butter.
Ensure all ingredients, especially eggs and heavy cream, are at room temperature for best results.
The cake can be stored in the refrigerator for up to 5 days.
For a more intense chocolate flavor, consider adding sugar-free chocolate chips to the mousse mixture.


Calories: 350kcalCarbohydrates: 10gProtein: 8gFat: 32gFiber: 6gNet Carbs: 4g
Keyword keto dessert, Keto Mousse, Low-Carb Chocolate Mousse Cake, Sugar-Free Chocolate Cake
Tried this recipe?Let us know how it was!