In a large bowl, whisk together pumpkin puree, sugars, oil, and eggs, until smooth.
Next, add the flour, baking soda, baking powder, salt, and cinnamon.
Stir well. Add water if the batter seems very thick.
We have enjoyed this with and without cream cheese frosting (If you don’t make your own, I like the Miss Jones brand from Wal-Mart). The general consensus from everyone we have served it to is that it really does not need the frosting, and the flavor pops better without it.