You want breakfast to be 10-15 min or less. When you go to McDonald's, how long does that take? I know it's fast food but how fast is it? I'm just curious.
I'm not a fan of most boxed (processed) cereals but you could at least improve by finding one that has no sugar or sodium added. One whole grain cereal that only has BHT added is shredded wheat. I don't think it's the best possible breakfast but it would be an improvement over your usual "sugar filled cereal."
Then there's wheat germ. It has no added sugar or sodium. And I don't think it has any preservative in it.
There's steel-cut oats and oat groats. They're different than oatmeal. By comparison, oatmeal is limy. If you soak one serving overnight, you can cook it in a few minutes. Or, you can bring the oats to a boil, turn the burner off, go shave and get dressed, and presto! It will be ready when you're ready.
Or, the oats that I mentioned can be cooked in the evening and put in the refrigerator. In the morning you just pop it in the microwave and heat it up. The few times that I had regular oatmeal cold , I liked it. It's not slimy when it's cold.
Once you decide which type of cereal you want, you need to round out the meal by adding about one or two teaspoons of chopped nuts and one serving (1/2 cup) of cut fresh fruit.