Preheat oven to 350 degrees F. Line a cookie sheet with parchment paper and set aside.
In a large mixing bowl, cream butter and sugar for 4-5 minutes until light and fluffy. Add in the eggs and vanilla, mix to combine.
In a small mixing bowl combine the flour, cream of tartar, baking soda, cinnamon, and salt. With the mixer on low slowly add the dry ingredients into the wet ingredients and mix until fully incorporated.
Chill the dough for 25-30 minutes, or overnight if needed. If chilling overnight, allow the dough to come to room temperature before scooping. Using a measuring spoon or a portion scoop, scoop even amounts of dough, about 1 oz. Roll into small balls until round and smooth.
In a small mixing bowl combine the sugar and cinnamon. Roll each cookie into the sugar mixture. Arrange 2 inches apart on the prepared cookie sheet pan.
Bake for 9-11 minutes until slightly golden brown, the cookies will still be very soft. Allow to cool 3-5 minutes on the cookie sheet before transferring to a wire rack to cool.