One of my most used appliances is a Tiger rice cooker with Porridge and timer function.
It's been used pretty much every day for 7+ years since I purchased it.
Every night I put 130g steel cut oats in, 400-420g of water, set it to cook for 45 mins and be ready for when I wake up in the morning. I'll then add 25g protein powder, sometimes a few berries or sprinkle with seeds/nuts. A nutritional power house.
I find steel cut oats more filling, a lot more substantial with ground oats more goopey. Steel cut oats are normally a hassle to cook but it's set and forget with the rice cooker. From what i've read I also believe the fact they sit soaking over night in water also is breaks down the starches which helps nutrient absorption.
Does wonders for digestion and satiety. Everything runs like clockwork with them. If I don't have them for a few days, things get irregular and a noticeable difference in satiety for the rest of the day where i end up snacking as feel hungry after meals.
I came up with a microwave steel cut oat method that worked well. Going from memory, I put the oats and hot water in a bowl in the microwave and set it for 45 seconds 100%, then 9 minutes at power level 2. One of those microwaves with "Cook 1" and "Cook 2" on it. The hot water I put in initially was basically boiling hot, you might need to do more time on cook 1 if you put in less hot water (at work we had one of those instant boiling water things).
Steel cut whole groats have really good nutrition. That tough brown skin is full of good stuff. I do mine in the pressure cooker for 20 mins with 1:1:3 oats:milk:water.
You can skip the whole cooking part if you leave your oats and water mixed overnight!
Put your oats, portion of milk, some berries, cinnamon and honey in a container and leave it in the fridge overnight.
Do it now.
Come thank me tomorrow morning once you've tried it.