Preheat oven to 350°F and line a baking sheet with parchment paper.
In a bowl, whisk together the flour, baking powder, baking soda, salt, and pumpkin pie spice.
In another bowl, beat pumpkin puree, oil, brown sugar, and granulated sugar until smooth.
Add the egg and vanilla extract, then mix well.
Gradually add the dry ingredients to the wet mixture and stir until combined.
Scoop tablespoon-sized portions onto the prepared baking sheet.
Bake for 12-15 minutes or until firm and slightly golden. Let cool completely.