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in a large cast-iron skillet, cook the bacon over moderate heat, turning once, until browned and crisp, 8 to 10 minutes.
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transfer the bacon to paper towels to drain and cut the strips in half.
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pour off all but 2 tablespoons of fat from the skillet.
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form the chicken into four 1/2-inch-thick patties and season generously with salt and pepper.
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add the patties to the skillet and cook over moderately high heat until browned on the bottom, about 4 minutes.
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flip the burgers and baste with bbq sauce, cook 3 minutes and turn and baste again
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top with the cheese and crisp bacon and cook until the cheese is melted and the burgers are just cooked through, about 3 minutes more
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top with the cheeseburgers, sliced onion, tomato and lettuce.
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close the burgers and serve right away.