It’s hard to beat a good queso IMO. Cheese, sausage, Rotel, maybe some sliced jalapeños. But sounds like you are looking for something less predictable here.
My bud on Bahrain used to make "cowboy casserole" he'd just chuck a bunch of mince, cheese, onions etc... He didn't use a recipe but it was brilliant every time and I've never been able to come close to replicating it.
Slight variation on the meatballs plan - Meatball Sliders. Simmer the meatballs is Pasta sauce - make them a hair flat and bring slider buns and some sliced Moz cheese. I have a meatball recipe that is killer with this but it sounds like you found a good one already.
You can slow cook your furniture balls and throw them at the tv after the Rams win.
This isn't slow cooking, but there wil not be a single one left no matter how many you get(Costco). The puff pastry is superb. We dip them in honey mustard.