Heat oven to 400. Mix thoroughly butter, shortening, 1 1/2 cups sugar and the eggs. Blend in flour, cream of tartar, soda and salt. Shape dough by rounded teaspoonfuls into balls.
Mix 2 tablespoons sugar and the cinnamon; roll balls in mixture. Place 2 inches apart on ungreased baking sheet. Bake 8-10 minutes or until set. Immediately remove from baking sheet.
Notes
*If using Self-Rising Flour, omit cream of tartar, soda and salt.