Think casseroles! (i.e. try to think of what you could make all in one big pan). For example, you could fill it with baked beans, throw a load of sausages in, add some gravy (instant, of course) and either some chilli powder or some paprika. Let it bubble away, so that the sausages cook in the gravy/tomato sauce. Result: A tasty sausage & beans casserole, which you can serve with some crusty bread!
Using two pans you could make a bolognese sauce in one and cook some pasta in another for spag-bol (or a variation on it, depending upon your choice of pasta).
If your caravan has an oven, buy some nice fresh sardines, wrap them in foil (putting perhaps 3 sardines, enough for one person, into each bundle) and bake them. When they're done, serve with some nice bread and olive oil.
This thread has 169 posts, so you might well find further suggestions here:
http://www.caravanclub.co.uk/community/discussions/welcome/new-to-caravanning-touring/Quick-n-easy-meals-for-the-caravan/rt/588902/