Tender Cheese Pastries

Mix softened butter with sugar until smooth and pale.

Add eggs and sour cream, beat well until combined.

Sift flour together with baking powder and vanilla, then gradually fold into the wet mixture.

Quickly bring the dough together without overworking it. Cover and chill for 30-50 minutes.

Whip the egg white, then fold it into the cottage cheese with sugar.

Roll out the dough to about 1/8 inch thick, cut rounds using a glass or cutter.

Place a spoonful of filling on each round, fold in half, and seal the edges firmly.

Transfer to a baking sheet and brush with egg yolk.