1 c. butter
1 c. oil
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
1/4 tsp. salt

Chill dough 1 hour. Form into ball size of walnut. Place on ungreased cookie sheet 2" apart. Press each cookie with bottom of glass dipped in sugar. Bake at 350 degrees for 10 to 12 minutes.