1 c. butter
1 c. vegetable oil
1 c. sugar
1 c. powdered sugar
1 tsp. vanilla
2 eggs
1 tsp. baking soda
4 c. flour
1 tsp. cream of tartar
1 tsp. salt
Sugar (for final step)

In large bowl, combine butter, oil and sugar. Beat until creamy. Add powdered sugar, vanilla and eggs; mix well.

In a small bowl sift baking soda, flour, cream of tartar and salt. Add to large bowl and mix well. Cover; chill for 2 hours. Roll dough into 1 inch balls; roll in sugar. Flatten on lightly greased cookie sheet. Bake at 350 degrees for about 12 minutes. Cool before removing.