I promised Heather I'd post this a long time ago and then everything went nutso. Here you go!
4 c. liquid (I use half water, half milk)
1 2/3 c. steel cut oats
cinnamon or vanilla extract (or both)
pinch of salt
Bring it all to a boil in a pot, then turn it off.
Portion into containers. I used half-pint canning jars (6 of them) but you could easily use tupperware if you like. The canning jars are cuter, though.
Stick those containers in the fridge. In the morning, add your toppings and shove in your lunch bag. Heat when you get to work. So much better than those packets of instant oatmeal.