I was going to make a serious comment asking if gas ovens could still work without electricity but then I realized, having just made an oven/jew joke, that there's no way you could take my question seriously now that I've included gas in the equation.
Gas oven. Or at least, our stove still works during an outage. Just turn on the flame (which will just put out pure gas) and light it with a lighter or match.
FWOOOM