1Heat oven to 400ºF.
2Mix 1 1/2 cups sugar, the butter, shortening and eggs in large bowl. Stir in flour, cream of tartar, baking soda and salt.
3Shape dough into 1 1/4-inch balls. Mix 1/4 cup sugar and the cinnamon. Roll balls in cinnamon-sugar mixture. Place 2 inches apart on ungreased cookie sheet.
4Bake 8 to 10 minutes or until set. Remove from cookie sheet to wire rack.