Mousse-Style Gâteau au Chocolat 🇫🇷

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Atsuko
Mouse style gateau au chocolat vanilla ice cream fruit mint leaf
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Atsuko

Founder of @Umami Sans Frontières

Everyone in my family is a chocolate lover 🍫. We adore the silky smoothness of mousse au chocolat just as much as the rich, dense texture of a good gâteau au chocolat. As my younger daughter insisted, “I want gâteau au chocolat, too!”, I set out to create something that brings the best of both: a mousse-style gâteau au chocolat, a chocolate cake inspired by the texture of mousse au chocolat ❤️. It also reminded me of something a French friend once said: “In France, moms often make gâteau au chocolat.” Whether or not that’s universally true, this simple, rich chocolate cake is part of the tradition, a true taste of maman in many French homes. And little by little, it has found a place in our own family life, too 😊.

Expense

💵

Preparation

30 mins

Baking time

35 mins

Rest time

120 mins

Ingredients

Cooking time: 1 hour 5 minutes (not including cooling time)
Ingredients:

For a 20cm cake pan

  • 150 g of Bittersweet Chocolate
  • 100 g of Unsalted Butter
  • 5 Eggs (M–L size)
  • 100 g of Sugar (divided in half)
  • 1 tsp of Vanilla Sugar (or a few drops of Vanilla Extract)
  • 1 pinch of Salt
  • 25 g of Unsweetened Cocoa Powder
How to make it:

1/ Prepare the cake pan: Grease the cake pan with butter and line the bottom with parchment paper. Lining the sides with paper is also recommended for easy removal.

2/ Melt the chocolate and butter: Place the bittersweet chocolate and unsalted butter in a large bowl and set it over a pot of simmering water (double boiler). Melt gently, stirring occasionally, until completely smooth and glossy.

Chocolate buttermelted chocolate and butter

3/ Beat the egg yolks: Separate the eggs into yolks and whites. Add half of the sugar (50 g) and the vanilla sugar (or a few drops of vanilla extract) to the yolks and whisk until thick and pale.sugar egg york

4/ Make the base batter: Check that the melted chocolate mixture is not too hot, then add it to the egg yolk mixture. Sift in the cocoa powder and mix until fully combined.

egg york melted chocolate and butter cocoa powderchocolate batter

5/ Make the meringue: In a separate bowl, add a pinch of salt to the egg whites and start beating. Gradually add the remaining 50 g of sugar in 2–3 additions while continuing to beat until stiff peaks form.meringue sugar

6/ Fold the meringue into the batter: Add the meringue to the chocolate mixture in three portions, folding gently with a spatula each time. Continue folding until no white streaks remain and the batter is smooth and airy.

Chocolate batter meringuebatter added meringue

7/ Prepare the water bath: Pour hot water into a baking tray to create a water bath for baking.

8/ Pour the batter into the pan: Pour the batter into the prepared pan and smooth the surface lightly.batter

9/ Bake in a water bath: Place the cake pan in the water bath and bake at 170°C/340°F(fan), or 190°C/375°F(conventional) for 30–35 minutes.

10/ Cool gradually in the oven: Once baked, turn off the oven and leave the door slightly open. Let the cake rest inside for 10–15 minutes to cool gradually.

gateau au chocolat

11/ Cool completely in the pan: Remove the cake from the oven and let it cool in the pan. Once completely cool, remove the side of the pan and gently invert the cake onto a plate to release it cleanly.

12/ Chill in the fridge: Refrigerate for 1–2 hours, or overnight for best texture.

13/ Finish and serve: Dust the top with cocoa powder or powdered sugar before serving.Mousse style gateau au chocolat holeone piece and hole of gateau au chocolat

🌟Simple Ways to Elevate Your Chocolate Cake🌟

⭐️ Tastes Even Better the Next Day: This mousse-style gâteau au chocolat gets even more delicious after a night in the fridge. The flavors settle, the texture becomes smoother. It’s totally worth the wait! 🍫

⭐️ Dress It Up with Ice Cream or Fruit: Dust the chilled cake with powdered sugar or cocoa powder, then serve it with vanilla ice cream or fresh fruit. Looks beautiful, tastes amazing, perfect for a little café-style treat at home.

⭐️ Bake in a Water Bath & Cool Gently: Baking in a water bath keeps the cake moist and smooth. And don’t rush to take it out—let it cool inside the oven with the door slightly open. That helps prevent cracks on top.

⭐️ Whip the Meringue Well, Fold Gently: Make sure your egg whites are whipped to stiff peaks, then fold them gently into the batter with a spatula. This keeps the texture fluffy and light.

⭐️ Keep an Eye on Your Oven: Every oven’s a little different, so don’t rely only on the clock. Check the surface and give the center a gentle wobble—it should jiggle slightly when it’s done.

⭐️ Great for Chocolate Lovers & Celebrations: This is our go-to birthday cake for my chocolate-loving husband and daughter😄It’s always a hit! 🎉 Rich and satisfying, it’s also a great choice when friends come over. Someone always asks for seconds—and there’s never any left the next day. 😉

⭐️ Try the Mousse au Chocolat Too!: You’ll also find my no-bake mousse au chocolat on Umami Sans Frontières. It’s super easy and just as delicious – definitely give it a try next time!Mousse au chocolat

Umami Sans Frontières – Copyrights 2025
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Written byAtsuko

Founder of @Umami Sans Frontières

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