Sugar Cookies

1 cup butter
1 1/2 cup sifted confectioners sugar
1 egg
1 tsp vanilla
2 1/2 cup sifted flour
1 tsp baking soda
1 tsp cream of tartar
1/4 tsp salt

Cream butter and sugar until fluffy.
Add egg and vanilla.  Beat well.
Sift together dry ingredients and blend into creamed mixture. 
Chill in refrigerator - it doesn't say how long, but I would guess until it's firm enough to work with?
Roll out on floured board and cut out with cookie shapes. 

Bake 6 minutes at 400 degrees.