Stir the cappuccino powder with 1-2 tablespoons of hot water and let it cool down. Warm the nut nougat cream over a warm water bath, stir until smooth. Mix dissolved cappuccino powder and coffee liqueur.
Mix mascarpone, quark, sugar and liqueur mixture. Roughly chop the biscuits. Add nut nougat cream to the coffee cream and stir briefly once, so that streaks appear. Layer cream and biscuit chips in 4 glasses.
Serve decorated with mint.