Cream together first 4 ingredients until light and creamy. A stand mixer works best.
In a separate bowl stir together the flour, baking soda, tartar and salt until well combined. In another bowl mix together the sugar and cinnamon. Set aside.
Mix flour mixture into the wet mixture a little at a time until well combined. Chill in the refrigerator for 30 minutes to 1 hour.
Scoop out dough into golf ball sized rounds. Generously roll around in the sugar and cinnamon mixture. Place on baking sheet leaving room between the cookies. Lightly grease baking sheet to prevent sticking.
Bake cookies at 400 degrees for 8-10 minutes. Cookies will be done when they are turning brown on top and just starting to crack a bit. They should be soft and somewhat chewy at this point.
This should make just over 2 dozen cookies. Enjoy
