Mix the mascarpone, quark, sour cream and sugar with a whisk until creamy. Dissolve the coffee with the water and stir into the mixture as well. Put the amarettini (save 4 pieces and leave whole to decorate) in a bag and crumble into small pieces.
On the bottom of the dessert bowls, put a tablespoon of the cream on top, then another layer of crumbs and amarettini crumbs, which are then drizzled with the amaretto and finally another layer of cream on top.
Chill for 2-3 hours and sprinkle with a biscuit and some cocoa powder to garnish.