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Preheat oven to 350°
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Sauté onion in olive oil over medium high heat until it starts to soften.
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Add 1 pound center-cut bacon and cook until crispy.
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With a vented spoon, remove bacon and onions from pan and place on folded paper towels.
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Blot with extra paper towels to remove as excess fat.
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Add ketchup, sugar, brown sugar, white vinegar and mustard to a large oven-proof dish.
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Add drained kidney and butter beans along with undrained pork and beans.
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Add bacon and onions to bean mixture. Stir well to combine.
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Bake uncovered at 350° for 45 minutes.