Bacon mixed right into the patty, stacked with onion rings, sautéed onions and mushrooms, and a fried egg on top.
Mix 2–3 slices of raw diced bacon into the ground beef, then form and grill the patty.
Prepare your favorite onion rings and sauté the onions and mushrooms.
Fry the remaining bacon and the egg.
Butter-toast the bun, then layer the patty, cheese, onion rings, sautéed onions and mushrooms, bacon, and the fried egg. Finish with mayo and mustard.
This one's meant to fall apart a little — that's the fun of it.