2 c. flour
3/4 tsp. baking soda
1 tsp. cream of tartar
1/4 tsp. salt
1 c. powdered sugar
1/2 c. firm butter
1/2 c. vegetable shortening
1 egg, beaten
1 tsp. vanilla
Granulated sugar for rolling

Sift dry ingredients into bowl; cut in butter and shortening until mixture resembles coarse crumbs. Stir in egg and vanilla; dough is fairly soft. Shape into 1-inch balls; roll in granulated sugar and place 2 inches apart on greased cookie sheets. Flatten to 1/2 inch thickness with bottom of glass dipped in granulated sugar. Bake at 350 degrees about 12 minutes or until delicately browned. Makes about 5 1/2 dozen.