Kansas City Chiefs fans call this the "awesome" burger because, well, it pretty much is. An onion cream spread and fried onions put this cheeseburger in a league of its own.
In a hot skillet, caramelize the onions with about 4 tablespoons of butter. Next add the garlic and sauté for 2 minutes longer. Deglaze the pan with the Worcestershire sauce, then stir in the green onion and season with salt and pepper. Cool.
Once the onion mixture is cooled, whip it into the cream cheese and sour cream until fully blended.
For the fried onions, mix the flour, spices, and seasoning together. Set aside. Heat about 1 inch of canola oil in a medium-sized skillet to 375 degrees. Soak the thinly sliced onions in milk, and then toss in the flour mixture until well coated. Fry until golden brown and crispy.
Grill the burger patties until cooked through, or until the internal temperature reaches 165 degrees.
Spread approximately ¼ cup of the onion cream cheese mixture onto the bottom of each toasted brioche bun. Set a burger on top of each bun and top with 2 slices of cheddar cheese, 3 slices of bacon, 1 tablespoon of A1 sauce, and a small handful of the fried onions. Top with lettuce & tomato and serve.