I too am a big fan of oatmeal. Funny enough, I like it a bit different than the author does. Particularly, I enjoy it with a less runny/liquid texture, and I don't submerge it like the author does afterward either. My setup I've eaten year round for 5 years now is:
* 1 cup dried old-fashioned oats
* Water plus a dash of creamer (oat milk recently) to submerge the oats
* 1-2 tablespoons of peanut butter
* Cinnamon to taste
* Sometimes flax seed to taste
The biggest thing is the cooking. On the stove top, bring the liquid boiling _and then_ add the oats. Don't add the oats before hand, as that changes their texture a bit too. Then I'll turn it down to maybe medium-low temp and cook most of the liquid off. It's usually 5-10 minutes. In the microwave, I mix the liquids and oats together because what other choice do you have? Then it runs for 3 minutes on high.
You'll end up with a bit of a softer texture, but the peanut butter thickens it up to be much more hearty. It's hard for me to enjoy other oatmeal that's runny.