Here is another great recipe from Cathy at Noble Pig http://noblepig.com/2008/11/11/the-pilgrims-would-approve.aspx
This cake is a great quick fall dessert. It only uses a yellow cake mix and a small can of pumpkin puree. I can eat more cake and not feel as bad because there is no eggs or oil added. I have made this cake twice this week (it really is that good). I have also thought about using cream cheese frosting for the cake.
1 yellow cake mix
1 15oz can pumpkin puree
1 & 1/2 cup powered sugar
4 tbsp water
3/4 tsp pumpkin pie spice
Combine cake mix and pumpkin.
Use a hand mixer until incorporated (it will be thick).
Pour into a greased 7x11 or 9x12 pan.
Bake at 350 for 28 minutes, or until a toothpick comes out clean.
Prepare glaze while cake is baking.
Mix sugar, water, and pumpkin pie spice and stir.
Let the cake rest for 5-10 minutes, then pour the glaze over.