Mix vanilla, butter, apple butter, and sugar until well-combined. I use my stand mixer with the paddle attachment.
Add egg; mix until incorporated.
Combine cream of tartar, baking soda, salt, pumpkin pie spice, and flour.
In small batches, add the dry ingredients to the mixture. Mix until combined.
Wrap dough in cling wrap and refrigerate for 1 hour.
Preheat oven to 350F. Line a baking sheet with parchment paper.
Roll dough out into small, even-size balls. Mix together ⅓ c. granulated sugar + 2 tbsp. pumpkin pie spice in a bowl. Roll each ball into the sugar coating and place on the baking sheet. Bake cookies for roughly fifteen minutes; allow cookies to cool + enjoy!
Notes
As apple butter is a prominent flavor in this recipe, purchase good-quality.
Refrigerate dough for the full hour before baking.
The cookies will be done when the edges + bottom are brown. The tops should still look soft when you remove them from the oven!