Cream together butter, shortening, and 1 1/2 sugar.

Add eggs and mix well.

Add flour, cream of tartar, baking soda and mix until it forms a dough that clean the side of the bowl.

In a separate bowl, mix together 2 tsp sugar and cinnamon.

Roll dough into 1 inch balls and toss in cinnamon sugar until completely covered.

Bake at 400° for 8 minutes.