take a can of pumpkin pie filling and fold in a container of cool whip. the kind with no fat or sugar. add pumpkin pie seasoning to taste.
so yummy

I'm pretty sure when it comes to Cool Whip, you can either get sugar free or fat free--not both (and all Cool Whips, to my knowledge, have trans fats also, even if it doesn't say so on the label--check the ingredients).

Also, do you mean canned pumpkin pie filling, or just plain canned pumpkin? I would think canned pumpkin pie filling would have the evaporated milk and sugar already added, which could add fat and sugar.

Not trying to discourage you on your dessert finding--just don't want you to think it's perfectly healthy to have in large amounts every day