Chill the mixing bowl and whisk
Whip the cream until soft peaks form
Melt the chocolate or prepare the mousse base
Separate the eggs if using an egg-based recipe
Whisk the egg yolks with sugar until smooth
Fold the melted chocolate or flavor base into the yolk mixture
Beat the egg whites until stiff peaks form
Gently fold the whipped cream into the mixture
Fold in the egg whites carefully to keep the mixture airy
Spoon the mousse into serving cups
Chill until set
Serve cold