I was going through major sweet sadness so my recipezaar cookbook is filled with the 'healthiest' highest rated desserts I could find. I have not made any of these, but they all have plenty of reviews saying they're yummy and the best nutritional content I could find.
Whole Wheat 0atmeal Cookies
(tiny bit of butter, egg whites)
http://www.recipezaar.com/203676
Snicker Doodle Muffin
(I'd up the whole wheat and try to throw in some applesauce and less butter/sugar)
http://www.recipezaar.com/187046
Carrot Spice Muffin
http://www.recipezaar.com/98447
Tofu Pumpkin Pie
*this is what I'm planning on making for myself on Thanksgiving, no crust though, so it's more like Tofu Pumpkin Pudding
(no milk, eggs, or butter)
http://www.recipezaar.com/78098
Stawberry Banana Tofu Pudding
http://www.recipezaar.com/173377