This makes enough oats for about four servings, but I actually like to double this and have cooked oats in the fridge for easy weekday breakfasts for the husband and myself. Leftover oats can be warmed in the microwave (if they've gotten a bit thick, add a splash of water, milk, or dairy-free substitute) and you're good to go!
P.S., my friend Aysegul just shared a post on her blog about making steel cut oats in a slow cooker. She has a genius technique that allows you to get the oats cooking before bed, and then wake up to warm, perfectly creamy porridge in the morning. If that sounds more appealing than cooking it on the stove, you can find her blog post and directions here:
Slow Cooker Steel Cut Oats | Foolrpoof Living.