I normally don't use mixes, but a friend on my last camping trip showed me this dirt simple cake. Works great in a Dutch Oven.
Mix a box of Duncan Hines Spice Cake mix with a 15 ounce can of Libby's pumpkin. Bake it using coals from the camp fire, under the oven, and on top.
Icing was a simple XXXX powder sugar and lemon juice glaze.