I've never been a breakfast eater. Need to be awake at least 3 hours before I can think about food. But I assume that kids would like something crunchy and sweet for breakfast. How about a trail mix? I put raw unsalted nuts, sunflower seeds etc. together with dried fruits - cranberries, raisins, cherries, apricots cut up - together in a bag and toss. If you ensure that they get meat for lunch/dinner - a sweet/crunchy breakfast might be what they're looking for. Good for energy and fat.
gale