Sugar Cookies

Several years ago one of my piano student's brought these to a piano party. His Mom made them and they were absolutely delicious even without frosting! (They are fabulous with frosting also.)

1 cup shortening
1 cup butter
1 cup powdered sugar
1 cup white sugar
2 eggs
4 cups flour
1 1/2 t. cream of tartar
1 t. baking soda
1/4 t. salt
1 t. vanilla.

Mix all. Bake at 360 degrees. 8-10 min. Sprinkle sugar on while still warm.