adapted from: All Recipes
1/2 c. butter, softened
1/2 c. shortening
1 1/2 c. sugar
2 eggs
2 tsp. vanilla
2 3/4 c. all-purpose flour
2 tsp. cream of tartar
1 tsp. baking soda
1/4 tsp. salt
4 Tbl. sugar
4 tsp. ground cinnamon
Preheat oven to 400 degrees. Cream together butter, shortening and sugar. Add the eggs and vanilla and mix until combined. In a separate bowl, combine the flour, cream of tartar, baking soda and salt and add to creamed mixture. Mix until combined. In a small dish, stir together 4 Tablespoons sugar and 4 teaspoons cinnamon.
Form dough into 1 1/2'' balls and roll in cinnamon and sugar mixture. Place on a lightly greased baking sheet. Bake for 7 minutes. Remove immediately from baking sheet and cool on wire rack. Makes around 4 1/2 - 5 dozen cookies.