Whisk together the flour, baking powder, baking soda, salt and cinnamon.
In a large bowl beat the eggs and sugars until light, approximately 4-5 minutes on low medium speed, then add the pumpkin puree and the oil, beat until combined.
Add the whisked dry ingredients and beat until just combined.
Pour into the prepared cake pan and bake for approximately 30-40 minutes or until a toothpick comes clean or with a few crumbs attached.