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Heat oven to 425°F. Place mugs (make sure they’re microwave or oven-safe) on a large baking sheet.
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Fill mugs 3/4 full with warm soup and top with bread slices.
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Generously sprinkle each with cheese and carefully place in the oven.
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Heat for 5-8 minutes or until the cheese is melty and slightly golden.
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Carefully remove the mugs from the oven, let the handles cool enough hold, and serve.