Chocolate mousse gets its famously light, airy texture from folding whipped cream into melted chocolate β a technique that takes a little care but no special equipment. Using good-quality dark chocolate makes the biggest difference in flavor here. The whole recipe comes together in about 20 minutes, then needs at least 2 hours in the refrigerator to set.
Melt the Chocolate: In a double boiler, melt the dark chocolate and butter together until smooth. Stir gently with a spatula. Allow the mixture to cool slightly.
Whip Egg Whites: In a clean mixing bowl, whisk the egg whites until soft peaks form. Gradually add the sugar while continuing to whisk until firm peaks are achieved.
Prepare the Chocolate Base: Whisk the egg yolks into the cooled chocolate one at a time. Be careful to integrate them smoothly, ensuring the chocolate does not seize.
Fold in Egg Whites: Gently fold the egg whites into the chocolate mixture using a spatula, maintaining as much air as possible to preserve lightness.
Whip the Cream: In another bowl, whisk the chilled heavy cream with the vanilla extract until soft peaks form.
Combine: Gently fold the whipped cream into the chocolate mixture in batches. Mix until fully incorporated and luscious.
Chill: Spoon the mousse into bowls or glasses and refrigerate for at least 2 hours before serving. This sets the mousse and deepens the flavors.
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Notes
For an extra touch, you can add a tablespoon of strong brewed coffee to the chocolate mixture to enhance the chocolate flavor.