Meatball meatloaf: Pound of ground beef, mix with what ever stuff you normally put in meatloaf. Shape into a ball cover with foil and toss into a fire for 30-35 flip and wait 30-35 minutes, eat.
Boyscout chicken: Put into a small dutch oven: chicken breasts, taters, green peppers, onions. Put hot coals under and over the oven. Wait an hour. Dinner. Pork chops work too.
Apple pie: Make apple pie as normal and do the same thing with the coals over and under the dutch oven for about 45-60 minutes. Serve with vanilla ice cream. Best camping breakfast ever.
The hamburger should not be too lean, as the veggies need some fat. I’ve also done this with chicken or pork pieces. The veggies are traditionally potato, onion, and carrot, sometimes with some celery. And I’ve made these in the oven at home, too. Very simple, and the timing doesn’t have to be exact. If you do this with chicken, it might need a drizzle of oil or a small pat of butter.
Since you’re car-camping then make pre-cooked meals in sealed pouches and bring them in dry-ice. that way you’re not wasting fuel or time cooking but have the luxury of bringing in really good food and doing a heat-and-eat. I would make stuff like gumbo or beef stroganoff or grilled salmon in a honey glaze. Stuff that holds up well when re-heating.