Old fashioned is what I have. A recipe that looked interesting basically toasted the oats with butter, then had milk poured on top and left in the fridge for 6 - 8 hours or overnight. Then you bring it just to a boil and use a whisk for about 10 minutes to get the oats to release some of the starch, which thickens them up. They are supposed to end up very creamy, with a nice flavor due to being toasted first. Haven't tried it yet, but hope to later tonight.
I do steel cut oats in the Instant Pot. Easy