What you need:

1/2 cup butter, softened
1/2 cup shortening
1 1/2 cups sugar
2 eggs
1/4 tsp salt
2 tsp vanilla extract
2 3/4 cups all-purpose flour
2 tsp. cream of tartar
1 tsp baking soda

For rolling cookies in:
2 tablespoons sugar
2 tsp. cinnamon

What to do:

Preheat oven to 400 degrees
Cream together butter, shortening, sugar, eggs and vanilla. Blend in flour, cream of tartar, soda and salt. shape dough by rounded spoonfuls into balls. Mix sugar and cinnamon.

Roll balls of dough in mixture. Place 2 inches apart on ungreased baking sheet. Bake 8-10 mins. Remove immediately and cool.