My most common version:

- rolled oats and water cooked in the microwave (mine has an "oatmeal" magic button )
- add frozen berries, ground flaxseed, cinnamon, and some unsweetened soymilk

Once in a while I will do steel cut oats...I just discovered it is much easier to cook a large batch, divvy it up into single serving containers (with my frozen berries) and freeze it, then just microwave them in the morning.

I've also been known to put cinnamon and soymilk on other grains including plain brown rice for breakfast.