In the bowl of a stand mixer, cream butter, white sugar, and brown sugar until light and fluffy.
Mix in the eggs, vanilla, and pumpkin purée.
In a separate bowl, whisk together the flour, cream of tartar, salt, and pumpkin spice. Add the dry ingredients to the pumpkin mixture, one cup at a time, mixing in between.
Mix the coating ingredients together in a small bowl to make the cinnamon-sugar mixture. Use a 2 Tablespoon cookie scoop to measure the cookie dough into balls.
Roll the cookie dough balls in the sugar coating and place on a prepared baking sheet lined with parchment paper, about 2 inches apart.
Bake the cookies at 375 degrees for 8-10 minutes. Remove from the oven and allow to rest on the baking sheet before transferring to a cooling rack.