Add all of the ‘Cinnamon Sugar Coating’ ingredients to a medium bowl, then whisk until combined. Set aside.
Chewy Pumpkin Snickerdoodle Cookies
Preheat oven to 350F. In a medium to large sized bowl, add the flour, baking soda, cream of tartar, salt, pumpkin pie spice, and cinnamon. Whisk well to combine, then set aside.
In a large mixing bowl , add the melted butter and brown sugar, then beat with a hand mixer until combined.
Add the egg yolk, pumpkin puree and vanilla, then beat until well-combined, scraping at the edges periodically. Add in the flour mixture and mix on low until combined, scraping at the edges. Ensure it is well combined, but do not overmix.
Prepare 2 baking sheets with parchment paper.
Using a small cookie scoop, scoop out your cookies. Roll each cookie in the prepared cinnamon sugar coating, then evenly place the cookies onto the baking sheets.