Sorry I didn't see your post sooner.
Do a search for "hobo pack" recipes (like YJteen mentioned above). Easy to make, easy to cook, and easy to clean up. Gives the boys a chance to prep, cook, and clean up their own meal.
We pick up a pack of preformed hamburger patties from Costco; some frozen tater tots; frozen, precut carrots; frozen diced onion, and a large can of cream of mushroom soup.
Each scout gets a square of heavy-duty aluminum foil. They each get a hamburger patty, and top it with carrots, onion, tots, and mushroom soup. Hit it with some salt & pepper, hot sauce, or bbq sauce, then seal it up tight. Scouts can write their names or otherwise make their packet unique. Toss the packets in a cooler until you're ready to cook.
Heat up some coals, then toss the packs directly on the coals for about 15 minutes on each side. Pull 'em out of the coals, open 'em up, and eat.
There are endless ways to mix it up and get creative.
Yours in Scouting,
Cubmaster Pack 96
Webelos 1 Den Leader