Preheat oven to 350 degrees F. Coat two 9×9 square baking pans with cooking spray and set aside. In a medium bowl, combine the oil, sugar, eggs, vanilla and pumpkin. Mix on medium speed until creamy and free of lumps. In a separate bowl, combine the flour, baking powder, baking soda, cinnamon, nutmeg and salt. Mix well. Gradually add to the pumpkin mixture until combined.