Butter Cutout Cookies

1 1/2 cups butter 
1 1/2 cups powdered sugar 
2 egg yolks 
4 cups flour 

Cream shortening and sugar together until light and fluffy. Add egg yolks and continue to beat. Add sifted flour and stir until well blended. Roll out on floured surface until about 1/8 inch thick. Cutout with your favorite shapes and decorate with candies, or colored sugars. Bake at 375 until golden, about 10 mins, makes 3-4 dozen depending on shapes used.