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

Mix first four ingredients and beat well. Add eggs and mix. Add other ingredients. Drop walnut sized balls on cookie sheet, about 1" apart. Dampen a glass bottom and dip in sugar, use to flatten slightly. Bake at 375 degrees until slightly brown on edges.