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Place the brown sugar, honey, garlic powder, onion powder, Worcestershire, and whiskey in a saucepan.
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Bring to a boil, then reduce and simmer for 25 minutes, or until sauce has reduced by half. Do not let it boil the entire time, you will end up with whiskey caramel!
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Saute onions in 1 Tablespoon of olive oil for 5 minutes.
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Add the sliced mushrooms and continue to cook until soft and caramelized.
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Add some sauce to the pan (if desired) and mix together with the onions and mushrooms.
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Form burgers into patties, season with salt and pepper, and cook over medium heat until thoroughly cooked.
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Place cheese slices on patties and cover to melt the cheese.
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Place cheeseburger on bottom bun,
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Top with the caramelized onion and mushroom mixture.
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Top with 2 slices of bacon.
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Top with lettuce, tomato slice, and top bun.
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Serve with your favorite side dish.