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 1/3 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.