Mix cake mix according to package directions. Slice off 1/3 down from top of oranges. Spoon fruit out of bottom 2/3 of oranges, leaving an empty shell. Fill the hollow shell 1/2 full with cake batter. Place lid back on orange. Wrap orange in 6x6" piece of foil. Place in coals 10 to 15 minutes. Yields 10 to 12 servings.