There are sandwiches, and then there are patty melts, the ones that make you stop mid-bite because the edges are crisp, the cheese is doing that stretchy thing, and the onions taste like they have been quietly working on themselves for about 20 minutes. This version keeps the classic diner vibe, but brings a little extra comfort with a creamy, tangy sauce that ties it all together.
It is the kind of meal that feels fancy for exactly three seconds, until you remember you are eating it in sweatpants at your own table. No judgment. If you can toast bread and flip a burger, you have got this. Just know it is a real-deal skillet situation, so give yourself a little time for the batches.