Preheat your oven to 350° F (175° C).
Cream together the sugar and slightly softened butter until light and fluffy.
Add in one egg along with the pumpkin puree to the creamed mixture and blend until smooth.
In another bowl, mix together flour, cream of tartar, baking soda, salt, and pumpkin pie spice. Gradually add this dry blend into your wet ingredients until a cohesive dough forms.
In a small bowl, combine sugar and cinnamon together to create a cinnamon sugar mixture.
Roll the dough into one-inch balls, coat each ball in the cinnamon sugar mixture, place on a parchment-lined cookie sheet, and gently press down before baking for about 10-13 minutes.