Usually this. It's so much easier than you think. I put a very small pot on the stove, 3/4 cup water on high and then put on my shoes and stuff. When it boils, drop in 1/4 oatmeal, and keep getting ready. Five minutes later, I eat it and head out the door.
Sometimes I stir in fruit (blueberries, strawberries or banana, etc). Sometimes an egg. Usually a bit of honey. Almost always a pat of butter and a splash of milk. It's seriously like, less than 10 minutes (and you barely have to do anything) and it's super energizing. AND you can easy clean the pot if you just rinse it right when you pour it into your bowl... hand full of soap, swish it around and rinse, let it dry back on the stove. 30 second cleanup. (I usually wait on the coffee until I get to work.
Usually my kids just want cereal and pop tarts and stuff, but sometimes they want the same oatmeal I'm having, in which case I'll just make a double portion.
NOTE: If it's not a weekday, I'll make eggs and waffles and stuff too. Maybe even bacon.