Preheat oven to 400 degrees.  In the bowl of your electric mixer with paddle attachment, cream butter until light and fluffly, about 3 minutes.  Slowly add sugar and beat well.   Add eggs, one at a time allowing first to incorporate before adding second.  Add vanilla and salt to mix.  Add cream of tartar, soda and flour and mix on low until combined.

Using a small cookie scoop, scoop out balls of dough into cinnamon sugar and roll until completely covered.  Place on ungreased cookie sheet and bake for 7 minutes, until lightly brown along the edges of the cookie.  Allow cookies to set on the pan for about 3-4 minutes before removing to cool completely.