Umpqua Oats available for sale in a bookstore cafe at Midway Airport in Chicago. They are super simple, no sweetener, and delicious! The staff at the cafe added hot water and I added a cut up banana and this was a great travel meal. It also passed the "not stinky" test, which I think that ALL travel food should adhere to lest you gross out your fellow travelers with your food smells.
While I probably wouldn't buy these for home due to all of the excess packaging waste that creates, I would definitely buy them again while I was on the go. I believe I have seen them in other airports, as well, so keep your eyes peeled!