a pancake, you just need hot water and a spoon. grab either from an airport restaurant or on flight.
note: for cereals and soups that you just add water to, you may want to consider buying a bottle of water before you board (after you’re through security). there are a few articles out there about the safety of hot water from a plane. you can skip the hot water provided on a plane if you like and use bottled, either provided by them, or from a bottle from a brand you trust—your meals won’t be warm, but they will still be delicious. it’s your personal choice how much you want to 