I guess it might be a bit late for tonights dinner, but here's mine ...

Slice some potatoes (maybe 6 largish) & a couple of onions.
Chop up some bacon, maybe 5 or so rashers.
Layer in casserole dish - potato, onion, bacon, grated cheese. Repeat. Repeat
Every second layer add salt & pepper & a couple of spoonfuls of thickened cream drizzled over the top.
Top with grated cheese. Bake until potatoes are tender (the thinner you slice them the better).

DH's fave