Contrary to popular belief, most of the foods that are advertised as "what's for breakfast" are worthless. Pancakes, cereal, muffins, waffles, oatmeal, or any other sugar and fat soaked (doughnuts) concoctions are useless as fuel to begin the day. What you need to start your engine is protein coupled with some complex carbs. Here is a breakfast that is easy and uses up leftovers and will allow you to work all day without even thinking about food.
Have you ever headed out the door after a bowl of cereal and a glass of orange juice only to find that about 10:30 AM you suddenly feel weak and maybe a little nauseous. It is what we call a "sugar drop". The simple sugars you consumed are gone and you are "out of gas". Try scrambled eggs with chicken (one of the single breasts from the freezer), leftover vegetable (broccoli in this case), cheese, and whatever is around. Olives, mushrooms, onion, green pepper...you get the idea. The main point is to add more protein to the eggs and get in some vegetables.
It all goes into one skillet and only takes a few minutes. I had to cook the chicken in this case but normally I have something already prepared. Of course, you could always make this for dinner if the mood hits you. I deliberately didn't take a picture of the finished dish because it's not that pretty to look at but who cares, you're eating alone anyway!