I put 1/2 cup of Quaker oatmeal in a big mug with 1 cup of water. Nuke it for 2 min 10 sec. Add about 1/4 cup half and half and eat it in the car on the way to work. It's simple and I've gotten to where I look forward to it and wouldn't think of doing without it.
I think its easy to overdo oatmeal. That's where it gets to be a chore to eat. Remember, moderation in everything - including oatmeal.