Pumpkin Snickerdoodles

Preheat oven to 350°. Line two large baking sheets with parchment paper. In a large bowl, whisk together flour, pumpkin pie spice, cream of tartar, baking soda, and salt. In another large bowl, combine butter and sugar and beat until light and fluffy. Add egg, pumpkin, and vanilla and mix until evenly combined. Gradually, add dry ingredients and mix until just combined.  Roll about 1 tablespoon of dough into a ball then roll in cinnamon-sugar and place on baking sheet.  Repeat with remaining dough and bake until tops start to crack and centers are just set, 12 minutes.