125 gram butter RT
2 tes vanilla sugar
1.5 dl suger
4 dl potato starch or (2dl potato starch and 2 dl corn starch)
Stir together sugar and butter to a smooth mass, then add the egg and stir to a smooth mass, then add the starch. Form small balls 2 cm in diameter, place them on a backing sheet and press them slightly, with a fork for wavy or a spoon for smooth cookies.
Bake at 200ºC for about 10 minutes.