Preheat oven to 350°F. In a large bowl, mix together flour, cream of tartar, baking soda, and salt together. Set aside.
In a stand mixer, cream together butter (barely softened) and sugar. Add eggs and vanilla and blend well.
.Add dry ingredients to wet ingredients and mix well. In a small bowl, combine remaining ⅓ cup sugar and 2 tablespoons cinnamon.
Use a small cookie scoop to scoop out dough, roll into a ball and then roll into the cinnamon sugar mixture- twice.
Place 2 inches apart on an ungreased cookie sheet.
Bake for 8 – 10 minutes. Let sit on the cookie sheet for a few additional minutes before removing to a wire rack to cool. ENJOY