Cream butter, 125 g sugar and 1 packet of vanilla sugar with the whisk of the hand mixer. Stir in eggs and 2 tablespoons of liqueur one after the other. Mix flour and baking powder and fold in half the chocolate drops. Grease a springform pan (26 cm Ø). Add the dough and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 12-18 minutes (test with sticks). Let cool on a cake rack.
Coarsely chop the remaining chocolate droplets. Mix quark, cream cheese, 50 g sugar, 1 sachet vanillin sugar and lemon juice. Whip cream until stiff and fold in. Remove the base from the mould. Spread the cream loosely on the base. Sprinkle with the remaining liqueur and sprinkle with chocolate drops
30 minutes waiting time