Preheat oven to 375 degrees F. Line two baking sheets with parchment paper, set aside.

In a large bowl, sift or whisk together the flour, cream of tartar, baking soda, salt, and cinnamon. Set aside.

Cream together the butter and sugar until fluffy, about 3 minutes. Add the egg and vanilla and stir until well combined. Add the flour and mix until just incorporated. Stir in the chocolate chips. Roll about 1 tablespoon of dough in between your hands and roll around in cinnamon sugar. Place on baking sheet and flatten lightly with the palm of your hands.

Bake until golden brown around the edges, about 10 to 12 minutes. Allow to cool slightly on baking sheet and then transfer to wire rack to cool completely. Leftovers can be stored at room temperature in an airtight container for up to 3 days.