World's Best Snickerdoodle Cookies

Ingredients:

• 1/2 cup butter, softened 
• 1/2 cup shortening 
• 1 1/2 cups white sugar 
• 2 eggs 
• 2 teaspoons vanilla extract 
• 2 3/4 cups all-purpose flour 
• 2 teaspoons cream of tartar 
• 1 teaspoon baking soda 
• 1/4 teaspoon salt 
• 2 tablespoons white sugar  

Directions:

1. Preheat oven to 400 degrees F.
2. Cream together butter, shortening, 1 1/2 cups sugar, the eggs and the vanilla. Blend in the flour, cream of tartar, soda and salt. Shape dough by rounded spoonfuls into balls.
3. Mix the 2 tablespoons sugar and the cinnamon. Roll balls of dough in mixture. Place 2 inches apart on ungreased baking sheets.
4. Bake 8 to 10 minutes, or until set but not too hard. Remove immediately from baking sheets.