Combine Dry Ingredients: In a medium bowl, whisk together flour, baking soda, cream of tartar, cinnamon, and salt. Set aside.
Cream Butter, Sugars, and Cookie Butter: In a large mixing bowl, beat butter, brown sugar, granulated sugar, and cookie butter together until light and fluffy (about 2–3 minutes).
Add Eggs and Vanilla: Mix in the eggs one at a time, followed by the vanilla extract.
Incorporate Dry Ingredients: Gradually add the flour mixture, stirring until just combined. Avoid overmixing.
Chill the Dough: Cover the dough and chill for at least 30 minutes to make it easier to handle and enhance flavor.
Preheat Oven: Set oven to 350°F (175°C) and line a baking sheet with parchment paper.
Roll and Coat: Scoop 1½-inch balls of dough, then roll each in cinnamon-sugar to coat completely.
Bake: Place cookies 2 inches apart on the baking sheet and bake for 9–11 minutes, until edges are set and centers look slightly underbaked.
Cool and Enjoy: Let cookies cool on the sheet for 5 minutes before transferring to a rack. The centers will finish setting as they cool.