Prepare the Dough: Preheat oven to 350°F (175°C). In a bowl, whisk together flour, baking soda, baking powder, salt, and pumpkin spice. In another bowl, beat butter, granulated sugar, and brown sugar until creamy. Add egg, vanilla extract, and pumpkin purée, mixing until smooth. Gradually add dry ingredients and mix until combined.

Shape the Cookies: In a small bowl, mix granulated sugar and cinnamon for coating. Scoop tablespoon-sized dough balls, roll them in the cinnamon sugar, and place them on a lined baking sheet about 2 inches apart.

Bake: Bake for 10-12 minutes until edges are set but centers remain soft. Let cool on the baking sheet for 5 minutes before transferring to a wire rack.

Serve: Enjoy warm or store in an airtight container for up to a week.