Troop camping works on the patrol method: each patrol plans their meals, buys their supplies, and cooks for their patrol.
Adult leaders stay out of the boys' way and take care of their own menus, shopping, and cooking, acting as their own patrol.
Many boys tend to value fast preparation and easy clean-up over a warm, tasty, filling meal. Adults can lead by example and demonstrate a wider range of meal possibilities.
Adult Patrol recipes and methods:
Planning time for cooking: http://scoutingmagazine.org/2006/01/scouters-speak-cooking-eats-up-time-for-activities/
Planning enough food for more active Scouts: http://scoutingmagazine.org/2007/05/outdoor-smarts-im-still-hungry/
One district's survey results about troop cooking practices (Scroll to page 19): http://bsatroop14.com/patrolmethod/THE_PATROL_METHOD_SURVEY.pdf
Articles about the broader role of adults on a campout: