Moelleux au Chocolat (Soft French Chocolate Cake)

Quick Summary: Moelleux au chocolat is a rich French chocolate cake with a dense, moist texture and a soft center. It is made with just chocolate, butter, eggs, sugar, and a little flour, and takes about 15 minutes to prepare, plus a short bake.

This post shows you how to make moelleux au chocolat at home, and explains how it differs from fondant au chocolat and chocolate lava cake.

What is moelleux au chocolat?

Moelleux au chocolat (also called gateau moelleux au chocolat) is a rich, moist French chocolate cake made with chocolate, butter, flour, eggs, and sugar. The word "moelleux" means "soft" or "moist" in French, so the name translates roughly as "soft chocolate cake," though it is more than an ordinary French chocolate cake.

It differs from fondant au chocolat and chocolate lava cake mainly in baking time and texture. Moelleux is the densest and most baked, fondant au chocolat is more moist with less flour, and a lava cake has a liquid, gooey center.

Because the name is French, it is often misspelled by English speakers. Common variations include moelleux chocolat, moelleux au chocolate, and molleux.

Moelleux vs fondant vs lava cake: what's the difference?

All three are French-style chocolate cakes, but they differ in texture. Moelleux au chocolat is baked through, so it stays soft and moist, like a light chocolate sponge.

A chocolate fondant and a chocolate lava cake are baked for less time, so the center stays runny and molten.

Moelleux is the most forgiving of the three because it does not rely on exact timing for a liquid center.

Why you'll love this recipe

• Simple ingredients. You only need chocolate, butter, eggs, sugar, and a little flour.
• Quick to make. It comes together in about 15 minutes, plus a short bake.
• Rich but not fussy. It is easier than a chocolate fondant or a lava cake, with a dense, moist crumb.
• Great for any occasion. Serve it for a weeknight dessert or a birthday, warm or at room temperature.
• A chocolate lover's treat. If you like this, try a chocolate ganache cake or French chocolate mousse next.

Ingredients

For ingredients and detailed instructions, refer to the recipe card below.

• Chocolate is one of the main ingredients in making this recipe. Choose top-quality dark chocolate with 70% cacao. You can experiment with different cacao percentages, but it will affect the cake's texture. Don't use chocolate chips; they don't work for this recipe. Also, cocoa powder is not typically included in the recipe to keep it authentically French.

• Butter: Opt for European-style unsalted butter with 82% fat content. This cake is all about the quality of the chocolate and butter.

• Eggs: The recipe calls for large-sized whole eggs at room temperature. Ensure to bring them to the counter an hour before you start.

• Sugar: Use cane sugar, but replace it with brown sugar, white granulated, or caster sugar, if desired.

• Flour: Use all-purpose flour to make the recipe. I haven't tried the recipe with another flour but wheat flour.

Ingredient substitutions

You can adapt moelleux au chocolat with a few simple swaps.

• Use good-quality dark chocolate (60 to 70 percent) for a deeper flavor, or semi-sweet chocolate for a milder cake.
• Swap the butter for a plant-based block to make it dairy-free.
• For a gluten-free version, replace the flour with a gluten-free blend or a spoonful of cornstarch.
• If your chocolate is already sweet, you can cut the sugar slightly.

Recipe variations

All the recipe variations come with the baking time experimenting. If you bake this cake a bit longer, you will have a chocolate cake resembling sponge cake, but denser. You will get a much moister texture with a few minutes less baking. 

Still, if you are looking for melt-in-your-mouth chocolate goodness, try other French chocolate desserts: French fondant cake or Fondant Baulois, both with melting textures. They are richer in butter and eggs and contain less flour.

How to make moelleux au chocolat

Step 1: Preheat the oven to 355°F (180°C). Prepare an 8-inch (20cm) springform pan or a cake ring, both wrapped in heavy-duty aluminum foil.

Step 2: With the softened butter and a pastry brush, grease the bottom and the sides of the mold. Line them with strips and a disk of parchment paper. Place the prepared cake ring on a baking sheet.

Step 3: Melt chopped chocolate with butter, cut into small cubes, in a double boiler or microwave at 30-second increments on 30% power, stirring occasionally with a wooden spoon. Then set it aside to cool down. 

Pro tip: Alternatively, you can use a water bath: place chopped chocolate with butter in a Pyrex glass bowl (or another heatproof bowl) over a small saucepan with some water.

Step 4: Bring the pan to medium-high heat and let the ingredients melt, stirring occasionally with a wooden spoon.

Step 5: In the bowl of a stand mixer or a separate mixing bowl, whisk together sugar and eggs (at room temperature) for 5 minutes until the mixture doubles in volume (photo 1). You can use an eclectic mixer if desired.

Step 6: Using a rubber spatula, gently fold the sifted flour into the egg and sugar mixture (see my guide to sifting flour). 

Step 7: Gently incorporate the cooled, melted chocolate into the batter with a spatula, taking care not to deflate it (photo 2).

Step 8: Pour the chocolate batter into the prepared mold (photo 3) and bake for 35 minutes. Remove the cake from the oven (photo 4) and let it cool before unmolding.

Expert Tips

1. Choose an 8-inch (20cm) springform pan for easy cake removal.
2. For a smaller or larger cake, recalculate ingredients with a simple cake pan calculator.
3. Depending on your tastes, adjust the cooking time to lengthen or shorten the cake's texture. 

What to serve with moelleux au chocolat

This cake is rich, so light pairings work best. Serve it warm with a scoop of vanilla ice cream, a spoon of crème anglaise, or homemade whipped cream and crème fraîche. Fresh raspberries or strawberries add a tart contrast, and a dusting of cocoa powder or icing sugar with a few chocolate shavings gives a simple finish.

Storing & freezing

Store moelleux au chocolat in an airtight container or wrapped with cling film in the refrigerator for 2-3 days.

You can freeze it for up to 3 months. First, cover the cooled cake with plastic wrap, then aluminum foil, and carefully bring it to the freezer.

To thaw the cake, leave it in the refrigerator for at least 6 hours, better overnight. Alternatively, you can defrost the cake quickly by placing it in a preheated oven at 300°F (150°C) for about 10 minutes. 

Recipe FAQ

What is moelleux au chocolat English?
Moelleux au chocolat translates as chocolate cake in English, but it means more of a fondant of chocolate with a melting texture than a regular moist chocolate cake.

What does moelleux au chocolat mean in French?
Moelleux au chocolat comes from "moelleux," meaning "soft," and "au chocolat," meaning chocolate as an adjective. So all it means is a chocolate dessert with a soft, non-melting texture, not a fondant au chocolate, and not with a liquid center like chocolate fondant or mi-cuit.

Can you make moelleux au chocolat ahead of time?
Yes. Bake it a day ahead and keep it covered at room temperature or refrigerated. Warm each slice for a few seconds before serving to restore its soft texture.

Love French recipes? Try these next!

• French Almond Cake
• French Fig Tart
• Classic French Crepes
• Royal Chocolate Cake Trianon

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The nutritional information has been calculated using an online recipe nutrition calculator such as Verywellfit.com and is intended for informational purposes only. These figures should be used as a general guideline and not be construed as a guarantee.