Preheat oven to 350°F.

Cream together powdered sugar, sugar, butter, and oil.

Add eggs and vanilla, mix well.

Add flour, baking soda, cream of tartar, and salt slowly while mixing well.

Make loose balls and roll in sugar (mix sprinkles with sugar for festive look)--place on cookie sheet and flatten with a glass (grease bottom of glass).

Bake 8-10 minutes.