Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the all-purpose flour, baking soda, kosher salt, cream of tartar, and freshly grated nutmeg. Set aside.
In a large mixing bowl, cream together the unsalted butter and granulated sugar until light and fluffy, about 2-3 minutes.
Beat in the large egg and pure vanilla extract until well combined.
Gradually add the dry ingredient mixture to the wet ingredients, stirring until just combined.
In a small bowl, combine the cinnamon with a tablespoon of granulated sugar. Form the dough into balls and roll each in the cinnamon-sugar mixture.
Place the cookie dough balls on the prepared baking sheet, spacing them about 2 inches apart.
Bake the cookies for 10-12 minutes. Halfway through, bang the baking sheet down firmly onto the counter.
Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack.