I have to have protein and fiber in the morning, or I feel starved and shaky by midday, so I usually eat a peanut butter sandwich on whole wheat, or egg in whole wheat toast (cut a hole in the middle of a slice of bread, butter the bread lightly, put the bread in a medium-hot skillet, crack an egg into the hole, and toast in the skillet till the egg is done, turning once or twice). Sometimes I have a string cheese with a handful of reduced-fat Triscuits.
My kids who do not like to eat first thing in the morning will drink Carnation Instant Breakfast--I make it with the Borden Hi Protein milk. Not the most nutritious thing in the world but it is fast and holds them till mid-morning snack time.