I am an experienced Scout leader (2 years Asst Webelos Den leader, 6 years ASM), Eagle Scout and experienced backpacker.

What you teach them to cook depends a lot on the style of camping that the troop they join will be doing.

If they do mostly car camping, then you can expand your repertoire considerably. Many of the ingredients you use in freezer-bag (FB) cooking can also be used in dutch oven cooking. Unfortunately, it doesn't go the other way easily.
Learning to use the correct spices, in either type, goes a long way in making the meal more palatable.

While car camping, I've made chicken cordon-blue as well as meatloaf along with many of the traditional dutch oven recipes.

These same finicky eaters have loved 99% of the FB meals that we have used on BP trips.

Watching someone who knows how to cook in the outdoors is a true pleasure. Watching someone who doesn't is truly painful.

A critical point is to teach them to be very careful with their stoves. Keep non-cooks out of the kitchen area until the food is ready.

Tango61