Make a shortcrust pastry from the dough ingredients and place in a greased springform pan.
Mix all ingredients for topping 1 and pour onto the dough. Bake in a preheated oven at 180 ° C for about 45 minutes.
Beat the egg whites with the sugar until stiff and add to the quark mixture. Bake for another 15 minutes. Turn off the oven and let the cake cool down in it.