Those can be somewhat carb-heavy, of course. If you do have an ice chest, hot dogs can be cut up into that while it’s boiling, or an egg or two can be whisked in, to add some protein.
You’d want to make sure it was something that didn’t require hours of cooking (e.g. NOT the bean-based stuff that we use at home in the Instant Pot).
If there will be a camp fire, anything you can cook on a long fork - e.g. hot dogs and the like - are a huge hit. Ditto foil packet meals - bring along some canned veggies (this is, perhaps, the only valid use I can think of for canned potatoes!!), some cut-up chicken or ground beef (both can be brought raw), some kind of sauce such as teriyaki or barbecue, and of course heavy duty aluminum foil. People enjoy assembling these, then you wrap up the packets and put them in the coals to cook. Make sure you have some kind of long tongs, of course!!!
The advice we were given, when camping in Grand Teton in 1985, was that the car was okay if not ideal - but whatever you may store in the car, make sure it’s covered. The ranger said “bears, being unable to read, cannot tell the difference between a box that holds crackers, and a box that holds Kleenex. They will break into the car to eat the crackers, and be PISSED. So, cover anything you leave in the car.”.
In any case, we had a big blanket that we laid over everything in the car, and had no trouble. But I do agree, anything that might smell strongly of food - such as empty wrappers - was disposed of in a bear-resistant trash can, some distance from our campsite, as soon as we were done with it. Anything we left in the car was either safely in the cooler (which would presumably reduce scent), or dried, or otherwise not too strong-smelling (e.g. bread, closed jar of peanut butter).
I think our alternative would have been to hoist food up in a net or something, high up a tree. That didn’t seem terribly practical (plus, bears can climb!).