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

Cream together the butter, oil, white sugar, and butter. Add eggs, vanilla. Mix well. Add flour, soda, cream of tartar, and salt. Chill mixture. Roll into balls, place on ungreased cookie sheet. Press with fork or wet glass. Bake at 350 degrees for 12 minutes.