Make a kneading dough from the first five ingredients and let it rest in the refrigerator for about 20 minutes. Now line a greased springform pan with it, pull up a 3 cm high rim.
Mix the poppy seed baking with 1 cup of sour cream and spread on the dough.
Separate 2 eggs, stir 1 cup of sour cream with the last five ingredients, i.e. sugar, salt, milk and 2 egg yolks until frothy. Beat 2 egg whites until stiff, fold in carefully and spread on top of the poppy seed topping.
Bake in an oven preheated to 180 ° C with top and bottom heat for 30 minutes, reduce the temperature to 160 ° C, bake for another 25 minutes.