I love oatmeal - I got hooked on it when I was pregnant, actually - random, I know! I was trying to be healthier and ended up having oatmeal for more breakfasts than I can count. I found it really good for keeping me full for a substantial amount of time - I'm often a grazer and just snack all morning if I don't have a filling breakfast, so oatmeal really cuts out that mindless snacking.
I also like that oatmeal on its' own is pretty bland, so that it can be super versatile when it comes to mixing stuff in. I like a few different combinations - adding sultanas and honey, apple and cinnamon, a little bit of natural maple syrup, even berries added in are fabulous! So many options - a big reason why it's one of the best breakfasts out there!