Preheat oven to 350 degrees F (175 degrees C).
Place bacon in a large skillet and cook over medium-high heat, turning occasionally, until evenly browned, about 10 minutes. Drain the bacon slices on paper towels.
Combine pork and beans, onion, brown sugar, Worcestershire sauce, and mustard in a 2-quart casserole dish. Chop drained bacon and stir into pork and beans mixture. Cover dish with aluminum foil.
Bake in preheated oven for 90 minutes.
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