1. Heat oven to 400 degrees F. Line a large cookie sheet with parchment paper or silicone baking mat (always recommended for cookies). Set aside.

Cinnamon-Sugar

1. Mix sugar and cinnamon in a small bowl. Place the mixture on  a dinner plate, and set aside.

Dough

1. Heat oven to 400 degrees F.
2. With a mixer, cream the sugar, butter, shortening and vanilla extract in a large bowl until light and creamy, about 1 minute.
3. Add the eggs, and beat well.
4. In a large bowl, combine flour, cream of tartar, baking soda and salt..
5. Gradually add the dry ingredients into the creamed sugar, mixing just until the dry ingredients are incorporated, about 30 seconds.
6. Refrigerate the dough for a minimum of 30 minutes to help the integrity of the dough since you want to be able to work with it. Let the dough sit at room temperature for 5 to 10 minutes before shaping it.
7. Shape dough into 1 1/4 inch balls. Roll balls in cinnamon-sugar mixture. Place 2 inches apart on the cookie sheet.
8. Bake for 8 to 10 minutes or until set. Remove from the cookie sheet to a wire rack to cool.