This is my grandmother's tried and true recipe! I usually double it when making Christmas cookies. Hope it helps!
6 tbsp. margarine/butter
6 tbsp. confectioners sugar
1 tsp. vanilla
1 egg yolk
1 cup flour
Mix butter & egg yolk. Add vanilla. Mix in sugar, then flour.
Chill dough. Roll to desired thickness and cut out with cookie cutters.
Bake at 350 for 8-10 minutes until golden brown.