Mix together dry ingredients in a bowl. 1 1/2 cups AP flour, 1 1/2 tsp pumpkin pie spice, 3/4 tsp cinnamon, 1/2 tsp baking soda, 1 tsp cream of tartar, and the 1/2 tsp of salt. Set to the side.
In a separate bowl, using a hand or stand mixer, beat your butter and sugar together for no less than 5 minutes. Add the egg yolk, pumpkin puree, and vanilla extract. Beat on medium-high speed until combined.
Scrape down the sides of your bowl as needed.
Add the dry ingredients to the wet ingredients. Fold together until well combined. Your dough will be quite thick.
Roll cookie dough into 10 balls. Each weighing around 60 grams. Roll each cookie dough ball in cinnamon-sugar topping.
Place a few inches apart on your baking sheet.
Bake cookies for 12 minutes. The cookies will be very soft and tender fresh out of the oven. Allow to cool for 10 minutes on the baking sheet before transferring them to a wired rack.