Potato Parmesan Pizza- A bit of Whimsy

I was on my way to make hash browns last night, but invented this instead. I put 5 peeled potatoes through the julienne blade of my food processor. I shredded up a small white onion as well. I put the vegetables in a bowl and tossed them in olive oil to coat them. I lightly salted them. Then I put them in a tart dish and sprinkled grated Parmesan on top. Then I put some Chorizo rounds on top, though pepperoni would have worked as well. Then a little more grated Parmesan, then 25 minutes at 375. It did not come out in slices, but I did not care. This would serve 4. I suppose this is really a gratin, but since I invented it, I get to name it.