Silky Chocolate Mousse with Chocolate Chips Cake Filling

Name: Silky Chocolate Mousse with Chocolate Chips Cake Filling
Prep time: 90 min
Total time: 90 min
Yield: 15 servings
Cuisine: Française
Ingredients: 2 cans (approx. 800 g) sweetened condensed milk; 250 g margarine or unsalted butter, softened; 500 g unsweetened cocoa powder; 6 eggs, yolks and whites separated; 6 tablespoons sugar; 1½ tablespoons unflavored powdered gelatin; 300 g white or dark chocolate chips

By Marie Lefebvre · Updated October 11, 2026

This silky, cloud-light chocolate mousse studded with melting chocolate chips is the ultimate filling for layered cakes. Incredibly rich yet airy, it brings a luxurious depth of flavor that turns any celebration cake into an unforgettable dessert. Once you try it, you will never go back to store-bought filling.

Prep⏱️ 90 min

Servings👥 15 servings

Difficulty📊 Medium

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🛒 Ingredients

15 servings

2 cans (approx. 800 g) sweetened condensed milk
250 g margarine or unsalted butter, softened
500 g unsweetened cocoa powder
6 eggs, yolks and whites separated
6 tablespoons sugar
1½ tablespoons unflavored powdered gelatin
300 g white or dark chocolate chips

🛍️ Recommended tools

🎂Moule à gâteauSee on Amazon →🪄Batteur électriqueSee on Amazon →⚖️Balance de cuisineSee on Amazon →

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Directions

1
Submerge the sealed condensed milk cans in a large pot of boiling water and cook for about 40 minutes to caramelize the contents. Remove carefully and let cool completely before opening.
2
Using a stand or hand mixer, beat the egg yolks with sugar and softened margarine until pale and fluffy. Add the cooled caramelized condensed milk and cocoa powder, beating until fully combined.
3
Sprinkle the gelatin over 3 tablespoons of cold water and let it bloom for 5 minutes, then gently heat until dissolved. Stir immediately into the chocolate mixture.
4
In a clean, dry bowl, beat the egg whites to stiff peaks. Gently fold them into the chocolate cream using a spatula, working in slow circular motions from the bottom up to keep the mousse light and airy.
5
Cover and refrigerate the mousse for 15 minutes to begin setting.
6
Fold in the chocolate chips and return to the refrigerator for another 10 minutes.
7
The mousse is ready to spread generously between your cake layers. Assemble the cake right after filling.

💡 Chef's Tip

For a more intense flavor, use 70% dark chocolate chips. Make sure the condensed milk has cooled completely before mixing, as warmth can deflate the beaten egg whites. This mousse can be made the night before and kept refrigerated until assembly.