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Preheat oven to 375 degrees.
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In a large bowl, gently combine beef, onion, breadcrumbs, milk, egg, salt and pepper then press into a 9×9 baking dish.
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Bake uncovered for 15 minutes, then remove and drain any excess fat.
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While the meatloaf is cooking add potatoes with just enough water to cover to a pot and bring to a boil on high heat. Cook for 15 minutes.
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Drain the water and add the milk, butter, salt and pepper mashing it all together until creamy.
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Spread over the meatloaf and top with cheese and bacon.
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Bake for and additional 15 minutes, until bacon is sizzling and cheese is bubbling and the mashed potatoes are slightly crispy.