1 cup granulated sugar
1 cup powdered sugar
1 cup butter or margarine (softened)
1 cup vegetable oil
2 teaspoons vanilla extract
3 1/2 cups all-purpose flour
3/4 cup cornstarch
1 teaspoon baking soda
1 teaspoon cream of tartar
1/2 teaspoon salt
Granulated sugar
Beat sugars, butter, oil and vanilla in large bowl with electric mixer on medium speed, or mix with spoon. Stir in remaining ingredients except granulated sugar. Cover and refrigerate about 2 hours or until firm. Heat oven to 375º. Shape dough into 1″ balls. Place about 2″ apart on ungreased cookie sheet. Press bottom of glass into dough to grease, then dip into granulated sugar; press on shaped dough until about 1/4″ thick. Bake 6 – 8 minutes or until set but not brown. Immediately remove from cookie sheet to wire rack.