Add the butter and egg cut into pieces, make a crumb with your fingers, if the crumb is dry, add one spoon of water or milk.
Pour the crumbs on the table and knead the dough. Wrap it in plastic wrap and put it in the refrigerator for now.
Apples to clear, to remove the middle of the and cut into slices. Pour cold water with the juice of half a small lemon.
Curd mix with powdered sugar, vanilla sugar, sour cream and yolk.
With the remaining halves of the lemon, grate the zest, squeeze the juice and mix with cottage cheese. Try sugar, add sugar and juice to taste, if necessary.
Put the dough on a silicone Mat or baking paper and using plastic wrap roll into a circle.
Jagged edges to be cut with a knife, in the middle put cheese filling and spread it, leaving a blank region, approximately 5-6 cm In the cheese to spread out slices of apples. The edges of the dough gently bend inward. The galette together with the paper on which the dough was rolled to transfer to the baking sheet.
Bake in a preheated oven at 180 degrees for about 25 minutes, look at your oven. The edges of the cooled galette sprinkle with powdered sugar.