1 c. butter
1 c. shortening (Crisco)
1 c. powdered sugar
1 c. granulated sugar
2 eggs
4 c. flour
1 tsp. cream of tartar
1 tsp. baking soda
1 tsp. vanilla

Cream butter, shortening, and sugars. Add eggs and vanilla to cream mixture and mix well. Add dry ingredients, mix well. Chill 3 or 4 hours or overnight. Roll in small ball, place on ungreased cookie sheet. Press down with glass bottom dipped in sugar. Bake at 375 degrees for 10-12 minutes until golden.