Preheat your oven to 375°F (190°C) and prepare ungreased baking sheets.

In a large bowl, cream together the unsalted butter, apple butter, and white sugar until light and fluffy, about 3-4 minutes.

Beat in the egg and vanilla extract until fully combined and smooth.

Whisk together the ground cinnamon, all-purpose flour, baking soda, and cream of tartar in a separate bowl.

Gradually add the dry mixture to the wet mixture and stir gently until a cohesive dough forms.

Cover the bowl with plastic wrap and chill the dough in the refrigerator for at least 2 hours.

Scoop portions of dough, roll into balls, and coat in cinnamon sugar.

Place the coated dough balls on the baking sheet, leaving space between each, and bake for 13 minutes.

Let the cookies cool on the baking sheet for a few minutes, then transfer to a wire rack.