Vanillekipferl x-mas cookies ala Marcus' mom

Ingredients:
500 g flour
160 icing sugar + additional to cover the cookies
6 egg yolks
300 g almond flour (or milled almonds)
300 g butter
A bit of salt

How-to-do: 
1) Mix all ingredients
2) Form to desired shapes
3) Bake at 150C air oven