Beat the cream with the vanilla sugar until stiff. Gently heat the milk in a saucepan or in the microwave and dissolve the powder coffee and the soaked gelatine in it. Then let the mocha milk cool down a little.
Mix the low-fat quark with the sugar until creamy, and gradually stir the mocha milk into the quark. Let it set slightly and then carefully fold in 2/3 of the whipped cream.
Pour the cream into glass bowls and let it set in the refrigerator for a few hours. Garnish with the rest of the cream, mocha beans and / or brittle before serving.