Take three eggs, crack 'em and dump them into a ziplock baggie, add salt and pepper to taste.
Throw in a palm full of cheddar cheese, a palm full of chopped red onion and a palm full of cooked sausage or ham or whatever floats your boat.
Seal your ziplock baggie, and place ziplock baggie inside of another ziplock baggie. You don't want a lot of air in either baggie, because heated air expands, and that could be bad for Domestic Bliss, but you don't have to get paranoid about it, either. When you're sealing the baggies, just kind of vent any spare air.
Seal and shake well.
Drop your ziplock baggies into a pot of boiling water, until omelette has achieved the desired consistency, usually somewhere between five and ten minutes.
Fish baggie out of boiling water, open and deposit omelette on plate, throw away baggies.