Gordon-style bacon cheeseburger ready in about 20 minutes with a seared beef patty, lots of crispy bacon, cheddar, onion, tomato, lettuce, and a lighter spicy burger sauce that is better balanced than plain mayo and sriracha.

Mix the burger sauce: mayonnaise, ketchup, mustard, and sriracha. Add a little chopped chili only if you want more heat — this keeps the sauce from feeling too heavy.
Fry the bacon until deeply crisp. Set aside; you want plenty on the finished burger.
Season the beef with salt and pepper. Gently shape a patty without overworking it. Heat the oil in the pan and sear until well browned; add the cheddar at the end so it melts.
In the same pan, cook the onion slice until softened and lightly charred on the edges.
Split the bun and lightly toast it with only a small amount of butter — the bun is already rich.
Build the burger: sauce, lettuce, tomato, patty with cheese, lots of bacon, then onion. Serve immediately.