Mix soft butter, egg, powdered sugar, vanilla sugar, baking powder in a bowl and beat everything with a mixer.
Then add the flour.
Knead the dough and refrigerate for 20 minutes.
Chop the peanuts. Remove the dough from the refrigerator, roll out a layer 7 mm thick and cut a large circle shape, and then make a smaller hole in the center of the hole.
Put the cookies in the form covered with parchment and put in the freezer for 20 minutes.
Lubricate each ring with slightly beaten yolk.
Turn each cookie oiled side into chopped peanuts.
Bake peanut sand rings for 15 minutes at 200 degrees.