Prep Time: 10 minutes
Cook Time: 10 minutes
Shape beef into two patties. Season with salt and pepper as desired. Cook to desired doneness on grill.
Meanwhile, cook bacon and sauté onion in butter (approximately one to two minutes) on flat grill or sauté pan.
Put patty on bottom half of bun. Place Sharp Cheddar Cheese and Pepper Jack Cheese on patty. Top with bacon and second patty.
Place Colby-Pepper Jack Cheese and Aged Swiss Cheese on top of the second patty. Top with remaining bacon and onions and top of bun.