Shortbread cookie recipe

+for about thirty cookies
°210 g of flour
°80 g of icing sugar
°1 sachet of vanilla sugar
°200g soft butter
°1 egg white
°1 pinch of salt
 First, start by working the softened butter with a whisk or mixer (or a kneader like me)
& adding sifted icing sugar, vanilla sugar also salt
(do not hesitate to lift the mass with a spatula and restart the robot in order to better incorporate the butter and the sugars)
then add the egg white and mix again
and finish with sifted flour
Enjoy !