In a medium-sized bowl, whisk together the flour, cream of tarter, baking soda and salt. Set aside.
In a large bowl, using a mixer, cream the butter and sugar until well combined (about 2 minutes). Mix in the eggs and mix until smooth. Add the dry ingredients to the sugar mixture gradually and mix until just combined. Chill dough for at least 30 minutes.
In a small mixing bowl, stir together the 2 tbsp sugar and 2 tsp cinnamon.
Preheat oven to 375F. Line baking sheets with parchment paper and set aside.
Take the dough out of the fridge and scoop out about 1 tablespoon per cookie. Roll each cookie into a ball and then roll each ball in the cinnamon sugar mixture to coat. Place the balls about 2 inches apart on the prepared baking sheets.
Bake 9-11 minutes. Remove from the oven and allow to cool on the baking sheets for 5 minutes and then transfer them to wire racks to cool completely.
