Mix the cappuchino powder with approx. 80 ml hot water according to the package instructions and allow to cool.
Mix the cold cappuchino well with mascarpone, coffee liqueur, powdered sugar and vanilla sugar (do not add the cappuchino all at once - this is a better way of regulating the consistency of the mixture). Chill the café mousse in the refrigerator.
The café mousse looks particularly nice when served in coffee cups and decorated with a cherry on top - a little cocoa powder on top - et voilà!