Every night up at camp we had a bedtime treat and one night we made these, they are awesome! Found this idea online in a couple of different ways so I just modified it to make it easy.
box of muffin mix (I used Betty Crocker chocolate chip) plus ingredients needed to make muffins
Cut oranges in half and scoop out fruit, cleaning rind as much as possible without ripping or poking holes in it. Prepare muffin mix according to package directions. Scoop batter into each orange rind half, filling about 2/3 full. Wrap loosely in foil, allowing room for expansion as the muffin will rise as it cooks. Place foil wrapped orange in the embers of the fire and cook for about 3 – 6 minutes depending on how hot the embers are. Open carefully and let cool a minute before eating. Eating muffin with a spoon seems to work best.