Best thing we have ever bought for the caravan is our Slow Cooker.
Meal for 2 or 4 takes about 15 minutes to prepare first thing (or do it the night before and put all the ingredients in a container or seal bag in the fridge overnight), and then pop the lid on, plug in, and off we go for the day.
Back to a steaming hot plate of stew, casserole, hot-pot or whatever, with the potatoes and veg all cooked together with the meat.
Can't beat it. It also means you get more value out of your pitch and hook up price! Might as well use it.