I agree with dweste, have some fun with this. Pre-appoint your son the chief chef, challenge him to plan a meal, take him out to buy the ingredients, etc.

A source of good one pot meals is on the freezer bag cooking site http://www.trailcooking.com/taxonomy/term/6%2B40 - I know that any of the pesto and linquine recipes are good, most of these in fact are easy for anyone to cook. If you're just going out for one night you can fudge on usual backpacking foods (corned beef, liptons etc) and cook with ingredients your son may be more accustomed to. Instead of dried, fruit bring some apples and cut them up for an appetizer - I always eat oranges on the trail. That kind of thing. Have some fun with it.