Preheat the oven to 356°F (180°C).
Separate egg whites from egg yolks.
Knead the dough using ½ cup of sugar, egg yolks, flour, butter, sour cream, and baker's ammonia. Leave the second half of sugar and egg whites for later.
Roll out the dough on a floured pastry board. Choose the thickness of your choice. Remember that the cookies will grow a bit while baking.
Cut out the cookies using cookie cutters of your choice.
Place the cookies on the baking tray lined with parchment paper.
Brush the cookies with egg whites and sprinkle with the remaining sugar.
Bake for 15 minutes.
