Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch pan.
In a large bowl, beat together the pumpkin puree, sugar, and oil. Add the eggs one at a time, beating well after each addition.
In another bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, and salt.
Gradually add the dry ingredients to the pumpkin mixture, mixing until just combined.
Pour the batter into the prepared pan and spread evenly.
Bake for 30 minutes, or until a toothpick inserted into the center comes out clean.
Allow to cool before serving.