1 c. oil
1 c. butter
1 c. powdered sugar
1 c. white sugar
2 eggs
1/2 tsp. cream of tartar
1/2 tsp. baking soda
1/2 tsp. salt
1 tsp. vanilla
5 1/4 c. flour

Mix well. Roll into 1 inch balls. Press flat with bottom of glass dipped in sugar. Place on greased cookie sheet. Bake 350 degrees, 10-12 minutes.