Wash the strawberries, sprinkle with 120 g of sugar and let them steep. Mix 150 g sugar and egg yolks until frothy. Mix in the flour, cornstarch and sour cream. The dough must be thick and flowing. Season with salt and vanilla sugar.
Beat the egg white until stiff and fold in. Mix in the strawberries loosely.
Put everything in a greased baking dish. Bake in the oven at 200 ° C for about 40 minutes. Then dust with powdered sugar and serve.