Mix flour, vanillin sugar, 200 g sugar, brittle, baking powder and 1 pinch of salt. Add 2 eggs and butter in pieces and knead into crumbles. Put 2/3 of the crumbles into a greased spring tray (32 cm Ø) and press them to a smooth base. Separate 3 eggs. Mix quark, pudding powder, 75 g sugar, 1 egg and 3 egg yolks. Beat 3 egg whites until stiff, add 100 g sugar and 1 pinch of salt. Fold into the quark mixture.
Pour the quark mixture onto the base and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: not suitable/ gas: level 2) for 50-60 minutes. After about 30 minutes spread the remaining crumbles on top. Leave to cool in the tin. Dust with icing sugar. Decorate with caramel threads