Preheat oven to 325°F. Line two baking sheets with parchment paper (or silicone baking mats) and set aside.
In a medium sized bowl, combine flour, salt, baking soda and cream of tartar. Set aside.
In a stand mixer (or large bowl with a hand mixer), cream together the butter and sugars until well combined. Add the eggs and vanilla and beat until smooth. Add the dry ingredients into the wet ingredients and mix until dough comes together.
In a small bowl, combine the sugar with the cinnamon for the topping.
Shape 2 tablespoons of dough into rounded balls. Roll dough in the cinnamon/sugar mixture and set it onto prepared cookie sheet. Repeat for the remaining cookies.
Bake the cookies for 10 to 12 minutes. The cookies may seem undercooked, but will continue to firm up after they are removed from the oven. Allow cookies to cool for 5 minutes on cookie sheet before transferring to a cooling rack.
