This small batch chocolate mousse is rich, smooth, and perfectly portioned for one or two people. Made with chocolate, whipped cream, and a single egg, it delivers a light, airy texture with deep chocolate flavor.
Place the chocolate and butter in a heatproof bowl over a saucepan with 1 inch of simmering water, making sure the bowl does not touch the water. Stir until smooth and melted.
Remove from heat and let cool. Whisk in the egg yolk until fully combined. Set aside.
In another bowl, beat the egg white until foamy. Add cream of tartar and beat to soft peaks. Slowly add 2 tablespoons of sugar and continue beating until stiff peaks form.
In a separate bowl, beat the heavy cream until it thickens. Add the remaining 1 tablespoon of sugar and vanilla, then beat to soft peaks.
Gently fold the beaten egg white into the chocolate mixture. Then gently fold in the whipped cream until combined.
Spoon the mousse into a dessert dish, cover, and refrigerate for several hours.
Top with extra whipped cream, if you'd like.
Notes
Separate Carefully: Use clean, dry bowls to separate the egg white. Even a small bit of yolk can keep the egg white from whipping properly.
Melt Slowly: Melt chocolate in a double boiler or microwave on low power, stirring often to avoid burning.
Fold Gently: Use a spatula to fold in the chocolate and whipped cream. Overmixing can deflate the mousse.
Chill Well: Let the mousse set in the fridge for the best flavor and texture.
What Are Soft Peaks? When you lift the beaters, the whipped mixture forms peaks that gently fold over on themselves instead of standing straight up. The tips will be soft and curl down.What Are Stiff Peaks? When you lift the beaters, the whipped mixture holds its shape firmly with straight, upright peaks that do not droop or collapse.