Spritz

 1 cup butter
2/3 cup sugar
3 egg yolks
1 tsp vanilla
2 1/2 cup flour
2 Tbs milk
colored sugars

Preheat oven to 400 °F.

Mix butter, sugar, egg yolks, vanilla, and milk; add flour. Force dough through cooky press, decorate with colored sugars. Bake 8-10 minutes.