Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened unsalted butter and 1 cup of sugar until light and fluffy.
Add in the large egg and vanilla extract and beat until well combined.
In a separate bowl, whisk together the flour, baking soda, cream of tartar, and ground cinnamon.
Gradually mix the dry ingredients into the wet ingredients until just combined.
In a small bowl, combine the remaining 2 tablespoons of sugar and ground cinnamon for the coating.
Form the dough into 1.5-inch balls and roll in the cinnamon-sugar mixture.
Place the dough balls on a baking sheet and bake for 10-12 minutes.
Let the cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.
