Preheat your oven to 350°F (175°C). Line your baking sheets with parchment paper.

In a bowl, whisk together the all-purpose flour, cream of tartar, baking soda, and salt until well combined. Set aside.

In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until fluffy.

Beat in the eggs, one at a time, then mix in the vanilla extract.

Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined.

In a small bowl, combine the sugar and cinnamon.

Scoop out tablespoon-sized portions of dough, roll into balls, and coat each ball in the cinnamon-sugar mixture.

Place dough balls on the baking sheets, spacing them 2 inches apart, and bake for 8 to 10 minutes.

Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.