Mix with an electrical mixer the icing sugar and the egg. Add the rest of the ingredients and mix to a dough.
Pour some icing sugar on a plate and dip your hand in it and roll the dough to small round balls. Place on a baking sheet.
Let the cookies rest for 4 hours.
Preheat the oven at 140 degrees Celsius and place the cookies in the middle of the oven for 10 minutes. Take the out and let them cool down.