This reminds me of a staple of my Boy Scout cooking: eggs in a bag. Just crack your eggs into a zip top bag (it must be a freezer bag to handle the temperature), add cheese, or peppers, or whatever you like in an omelet, suck out the air, and put it in boiling water until it’s done. Then, if you eat your omelet straight out of the bag, you have no clean up!

It had never occurred to me then to try to cook anything else in bags, but I'm certainly going to try this out.