For the crumbles, crumble the pretzel roughly. Chop 50 g chocolate. Mix 150 g flour, 1 tablespoon cocoa, fat in flakes, 35 g sugar and alpine salt with the dough hooks of the hand mixer. Work into crumbles with your hands. Mix in chocolate and pretzel.
Chop the rest of the chocolate and melt over a hot water bath. Separate the eggs, chill the egg whites. Beat the egg yolks, 100 g sugar and vanillin sugar until creamy with the whisk of the hand mixer. Stir in cream cheese and quark. Mix starch and 2 tbsp. cocoa, sieve onto the cheese cream and stir in. Stir in liquid chocolate. Beat the egg whites until stiff, adding 75 g sugar. Fold in 2 portions of beaten egg whites into the cream cheese.
Put the cheese mixture into a greased and flour-sprinkled springform pan (approx. 26 cm Ø) and smooth it down. Spread crumbles on top and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 45 minutes. Remove from the oven, let it cool down, remove from the tin and cut into pieces.