What are your favorite sandwich / sammich / sanguich combos?

I made a hash brown and Dubliner on pain de mie sandwich yesterday, grilled in butter. Delish. I will take a photo next time. I made the hash browns myself, frying them in butter and oil.

Inspired by all the ppl adding a hash brown to their Filet o Fish or Egg McMuffins.

I am fairly new to potato sandwiches.