I think its good for them to try different things for breakfast lunch and dinner despite if they want it or not. I feel that I am not a “short order cook”, and what were having is what were having. If he says , I want an omelet , I would say, today we’re having cereal….maybe tomorrow we can make an omelet…..and stick with your plans. They learn that they are not always going to get exactly what they want, and this is easier for you too.