So a lot of my recipes so far have included oatmeal, but I never clarify what type. I do that because they’re all so interchangeable. The only difference between any oatmeal, and in this post specifically old fashioned oats vs quick oats are the size!
The oats on the left are old fashioned, right are quick oats. See the difference? That’s the reason why the cook so quickly! So if you use quick oats in a recipe, they probably don’t need to be cooked for as long, so be careful. The opposite goes for old fashioned. I hope this helped! -th