Preheat oven to 375°F and line baking sheets with parchment paper or silicone baking mats.
In a small bowl whisk all-purpose flour, cream of tartar, baking soda, salt, cinnamon, nutmeg and ginger.
Use a stand mixer fitted with the paddle attachment to cream softened butter, granulated sugar and brown sugar until light and fluffy.
Add the egg, egg yolk, pumpkin puree and vanilla then mix until just combined. Scrape the sides of the bowl.
Add the dry ingredients to the bowl all at once then mix on low until just combined.
Mix the granulated sugar and cinnamon in a small bowl. Using a 3 tablespoon cookie scoop, scoop dough and roll in cinnamon sugar then place onto lined baking sheets (be sure to adjust the baking time if your cookies are smaller/larger).
Bake pumpkin snickerdoodles at 375°F for 11-12 minutes.
Notes
Weigh your ingredients using a kitchen scale! Measuring ingredients by volume is not accurate.
Butter: I recommend using unsalted butter. You can use salted butter, just be sure to omit the 1/2 tsp salt.
Store Pumpkin Snickerdoodles in an airtight container for up to 5 days at room temperature or up to a week in the fridge.
Nutrition: the provided nutritional information is an estimate per serving. Please read my Nutrition Disclaimer for more information.