Mix the margarine, sugar, flavor and egg yolks together. Add the pudding powder, quark and baking powder and stir until frothy. Beat the 6 egg whites into snow and fold in. Put the dough in a greased springform pan and bake in a preheated oven (fan oven) at 180 ° C for approx. 1 hour 15 minutes. After about 1 hour of baking time, the temperature can be reduced to 160 ^ C.