Teresa's Snickerdoodles

1 cup shortening
¾ cup white sugar
¾ cup brown sugar
2 eggs
1 tsp. vanilla
2 tsp. cream of tartar
1 tsp. baking soda
½ tsp. salt
2 ¼ cups flour

Mix dough and chill. Roll dough into balls, and roll in cinnamon and sugar mixture. Bake at 375° for 12 minutes.