For camping - and power outages, we have the standard Coleman 2 burner propane stove, a portable / tabletop propane BBQ and also a MSR PocketRocket.

With plenty of propane and isopro fuel for these and along with a inverter generator to power the freezer and fridge, I think we are good for a few weeks of cooking. Any longer duration of an area wide power outage, then there may be bigger socioeconomic, logistical and security problems to deal with besides just worrying about cooking.