Preheat oven to 360 degrees.
Put flour, cream of tartar, baking soda and salt together in a bowl and mix. Set aside.
In a stand mixer mix butter and sugar together for one minute until well incorporated.
Add egg and vanilla and mix.
Add the flour mixture all at once into the mixer and mix until just combined.
Combine sugar with cinnamon for the coating in a separate bowl and mix well.
Roll dough into approximately 1 1/2 inch ball. It should make approximately 24. Then roll each ball in cinnamon sugar. Place on a baking sheet or plate that has been lined with parchment paper.
Chill the dough balls for 20 minutes in the refrigerator.
Put on two baking sheets that are lined with parchment paper. Bake 12-14 minutes. The cookies should be slightly browned and starting to crack on the top
Cool 5 minutes then move to a wire rack to finish cooling.
Store in an airtight container. Will keep for several days.
