Finely crumble the brown cake. Cream mascarpone, quark, milk, sugar, vanillin sugar, cinnamon and lemon peel with the whisk of the hand mixer. Divide 3/4 of the cake crumbs into 4 glasses and add a tablespoon of cranberries to each.
Spread the cream over it. Shortly before serving, add remaining cranberries to the cream and sprinkle with remaining crumbs. Decorate with mint and serve dusted with icing sugar.