Going to agree with the egg sandwich idea. It's what I eat most mornings. It's fast, easy, reasonably healthy, and reasonably inexpensive. Plus you can be as simple or fancy as you want. I tend to fry my eggs rather than the microwave idea (since it takes about the same time to fry as it takes to toast the bread). Get yourself one of those one egg pans. They work great for cooking a sandwich sized egg patty (you can even cook two eggs if you want). You can either put slices of stuff on top as Joph suggested or dice up stuff and toss it in while you're cooking. Diced ham and peppers is particularly yummy.
Edited, Oct 10th 2012 1:18pm by gbaji