3 eggs, seperated
3/4 of a stick butter
8 ounces bittersweet chocolate (no more than 60%)
Melt chocolate and butter together.
Whisk egg yolks until thick and pale in color.
Whisk whites until soft peak.
Fold in the yolks to the chocolate mixture.
Fold in the whites.
Fold in the whipped cream.
The amount of cream used depends on how chocolaty you want your mousse. (also makes it lighter in texture, but of course the more you add, the more calories you are adding, too.)