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

Cream butter, oil and sugars; add vanilla. Stir in eggs and beat well, add dry ingredients and chill. Roll in walnut size ball, flatten with glass dipped in sugar. Bake at 350 degrees for 10-12 minutes. Very crisp. Half of a recipe makes a lot.