Ya lost me with savory oats! Oats are for sweeter preparations: cold cereals, and baked goods. I can’t stomach savory oats.
However, there’s nothing in that recipe that wouldn’t work with that southern staple, grits. And, FWIW, I’ve had hash browns prepared similarly as well.
That said, I bet you could use a similar approach with ANY grain that works for your diet. As is, it would be just as good with corn as it would be with its byproduct, grits. Then there’s quinoa, barley, chia, flaxseed…. Lots of nutritious savory options in the grain family.
Hell, hit an ethnic grocery and try out some of the hundreds of RICE options! Lots of them are more nutritious and flavorful than the ubiquitous white rice of American cuisine.