2 ¾ cups flour       

2 tsp. cream of tartar

1 tsp. baking soda   

¼ tsp. salt

1 1/2 cups sugar     

½ c. (1 stick) butter, softened

½ cup shortening     

2 eggs

¼ cup sugar     

2 Tbsp. cinnamon

Preheat oven to 400°.

Combine flour, cream of tartar, baking soda, and salt; set aside. Combine 1 ½ cups sugar,

butter, and shortening. Beat on medium speed until light and fluffy, about 2 minutes. Add

eggs and beat to combine. Add dry ingredients and beat to combine.

In a small bowl, combine remaining ¼ cup sugar and cinnamon. Shape dough into 1 ¼-inch

balls. Roll balls in cinnamon-sugar mixture. Place 2 inches apart on ungreased cookie sheet.

Bake until the cookies are set in center and begin to crack (they will not brown), about 10

minutes. Transfer the cookie sheets to a wire rack to cool about 5 minutes before transferring

the cookies to wire rack. Cool completely.