1/2 c. butter, softened
1/2 c. shortening
1 1/2 c. sugar
2 eggs
2 3/4 c. flour
2 tsp. cream of tartar
1 tsp. baking soda
1/4 tsp. salt
2 1/2 tbsp. sugar
2 1/2 tsp. cinnamon

Heat oven to 375 degrees. Mix butter, shortening, sugar and eggs. Blend in flour, cream of tartar, soda and salt. Make into little balls. Mix 2 1/2 tablespoons sugar and 2 1/2 teaspoons cinnamon. Roll balls in sugar and cinnamon mixture. Bake on ungreased cookie sheet 2 inches apart for 8 to 10 minutes.