In a small bowl, combine granulated sugar and cinnamon, mixing until well blended. Set aside.

In a medium bowl, whisk together flour, baking soda, and pumpkin pie spice until thoroughly combined.

In a large bowl, beat softened butter and sugar until light and fluffy. Add pumpkin puree and egg, mixing until smooth.

Gradually add dry mixture to wet ingredients, stirring gently until just combined.

Roll the dough into 1-inch balls and flatten slightly, shaping into rounds or desired Halloween forms.

Press each cookie shape into the cinnamon sugar mixture, coating both sides well.

Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper. Bake cookies for 10-12 minutes or until lightly golden.

Allow cookies to cool on the baking sheet for about 5 minutes, then transfer to a wire rack to cool completely.