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Preheat oven to 400°F (200°C). Grease a 9×13-inch casserole dish.
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Place potatoes in an even layer in the dish.
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Sprinkle onion and bacon over the potatoes, then dot with butter.
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Cover with foil and bake for 45 minutes.
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Remove foil and stir potatoes.
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Switch oven to broiler and brown for about 5 minutes, stirring every minute for even crispiness.
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Serve immediately.
 
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