Coarsely chop 100 g chocolate and melt over a warm water bath. Cream fat, sugar and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one after the other. Stir in chocolate. Mix flour, cocoa and baking powder and stir into the dough. Grease 6 box-shaped cups (350 ml each) and sprinkle with breadcrumbs. Fill 1/3 of each form with dough and spread 6 Rolos on the dough.
Fill in the remaining dough. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 30 minutes. Remove and let cool off. Chop 300 g chocolate and melt over a warm water bath. Cover the cake with it. Put the sherbet flummery on top. Let the chocolate dry
waiting time approx. 1 1/2 hours