Preheat oven to 350 degrees. Coat a 10-inch by 15-inch jelly roll pan with nonstick spray.
In a small bowl, whisk together flour, baking powder, baking soda, cinnamon, pumpkin spice, and salt. Set aside.
In a large bowl, combine sugar, pumpkin, and oil. Mix well. Whisk in eggs.
Fold in flour mixture until uniformly combined. Spread into prepared pan. Bake for 20 to 25 minutes, until a toothpick inserted comes out clean. Cool completely, at least 30 minutes.