Easy

Ultimate 3-Layer Keto Chocolate Mousse Cake

Name: Ultimate 3-Layer Keto Chocolate Mousse Cake
Prep time: 30 min
Cook time: 35 min
Total time: 65 min
Yield: 12 servings
Ingredients: 1. The Cake Base; 1/3 cup (40 g) coconut flour; 1/3 cup (63.33 g) granular sweetener (erythritol, allulose, or a mix); 3 tbsp (15.22 g) cocoa powder (preferably Dutch process); 2 tbsp (21.4 g) whey protein powder (chocolate, vanilla, or unflavored); 1 1/2 tsp baking powder; 1/2 tsp salt; 3 large eggs (room temperature); 1/3 cup (78.86 ml) avocado oil; 3/4 tsp vanilla extract; 1/4 cup (59.15 ml) leftover coffee or water (add more if needed); 2. The Chocolate Mousse; 1 large egg + 2 large egg yolks; 3 tbsp (30.43 g) allulose or xylitol; A pinch of salt; 1 1/3 cup (315.45 ml) heavy whipping cream (divided); 3 ounces (85.05 g) 100% unsweetened chocolate (chopped); 1/3 cup (63.33 g) powdered sweetener (powdered erythritol recommended); 1 tsp vanilla extract; 3. The Chocolate Ganache; 1/3 cup (78.86 ml) heavy whipping cream; 3 tbsp (30.43 g) sweetener (allulose preferred to avoid crystallization); 1 1/2 ounces (42.52 g) 100% unsweetened chocolate (chopped); 1/2 tsp vanilla extract

Indulge your deep chocolate cravings without breaking your keto lifestyle! This Keto Chocolate Mousse Cake is a chocoholic’s ultimate dream come true. Crafted with three heavenly layers, it starts with a tender, nut-free chocolate sponge base, piles high with a silky-smooth sugar-free mousse, and is finished with a rich, glossy chocolate ganache. It looks, feels, and tastes like it came straight out of an expensive luxury bakery!

🔪

30 min

Prep

🔥

35 min

Cook

⏱

65 min

Total

👤

Servings

What you'll need

Ingredients · 12 servings

1. The Cake Base
1/3 cup (40 g) coconut flour
1/3 cup (63.33 g) granular sweetener (erythritol, allulose, or a mix)
3 tbsp (15.22 g) cocoa powder (preferably Dutch process)
2 tbsp (21.4 g) whey protein powder (chocolate, vanilla, or unflavored)
1 1/2 tsp baking powder
1/2 tsp salt
3 large eggs (room temperature)
1/3 cup (78.86 ml) avocado oil
3/4 tsp vanilla extract
1/4 cup (59.15 ml) leftover coffee or water (add more if needed)
2. The Chocolate Mousse
1 large egg + 2 large egg yolks
3 tbsp (30.43 g) allulose or xylitol
A pinch of salt
1 1/3 cup (315.45 ml) heavy whipping cream (divided)
3 ounces (85.05 g) 100% unsweetened chocolate (chopped)
1/3 cup (63.33 g) powdered sweetener (powdered erythritol recommended)
1 tsp vanilla extract
3. The Chocolate Ganache
1/3 cup (78.86 ml) heavy whipping cream
3 tbsp (30.43 g) sweetener (allulose preferred to avoid crystallization)
1 1/2 ounces (42.52 g) 100% unsweetened chocolate (chopped)
1/2 tsp vanilla extract

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How to make it

Instructions

01

Step 1: Bake the Cake Layer
02

Preheat & Prepare: Preheat your oven to 325°F (163°C). Lightly grease an 8-inch round cake pan with a removable bottom (or springform pan). Line the bottom with parchment paper and grease the paper.
03

Mix Dry Ingredients: In a large bowl, whisk together the coconut flour, sweetener, cocoa powder, protein powder, baking powder, and salt.
04

Add Wet Ingredients: Stir in the eggs, avocado oil, and vanilla extract until fully combined. Gradually pour in the coffee (or water) until the batter becomes thick but easily scoopable.
05

Bake: Spread the batter evenly into the prepared pan. Bake for 15 to 20 minutes, or until the top is just firm to the touch. Remove from the oven and let it cool completely inside the pan.
06

Step 2: Make the Chocolate Mousse
07

Double Boiler Setup: Set a heatproof bowl over a pan of barely simmering water (ensure the bottom of the bowl doesn't touch the water). Combine the egg, egg yolks, allulose, and a pinch of salt. Whisk well, then whisk in 1/3 cup of the heavy cream.
08

Thicken: Whisk continuously over low heat until the mixture is frothy, thick, and reaches 160°F on an instant-read thermometer to ensure food safety.
09

Melt the Chocolate: Remove the bowl from the heat. Stir in the chopped unsweetened chocolate, let it sit for 5 minutes to melt, then whisk until perfectly smooth. Set aside to cool to room temperature.
10

Whip & Fold: In a separate bowl, beat the remaining 1 cup of heavy cream with the powdered sweetener and vanilla extract until stiff peaks form. Gently fold the whipped cream into the cooled chocolate mixture in three separate additions.
11

Layer & Freeze: Spread the mousse evenly over the cooled cake base. Smooth the top and place the entire pan into the freezer until firm. Once frozen, run a warmed sharp knife around the edges to release the cake from the pan structure.
12

Step 3: Pour the Chocolate Ganache
13

Simmer Cream: In a small saucepan over medium heat, whisk the heavy cream and sweetener together until it reaches a gentle simmer.
14

Combine: Remove from the heat, add the chopped chocolate and vanilla extract. Let it rest for a few minutes to melt, then whisk until completely smooth.
15

Finish: Pour the warm ganache over the top of the frozen cake, allowing it to drip beautifully down the sides. Refrigerate for 20 minutes to let the topping set before slicing.