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Preheat oven to 350 F.
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Steam broccoli until tender-crisp.
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In a bowl, whip together soup, milk, sour cream, garlic powder, and pepper.
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Stir in chicken, bacon, cheddar, and mozzarella.
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Transfer mixture to a greased 9×13 baking dish.
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Combine breadcrumbs and melted butter; sprinkle over top.
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Bake uncovered for 35 minutes until bubbling and golden; let rest 5 minutes before serving.