"This simple dish is the quintessential American comfort food...."
INGREDIENTS
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1 lb (450 g) elbow macaroni
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pinch of ground nutmeg
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6 tbsp unsalted butter, plus more for the baking dish
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1 3/4 cup whole milk, warmed
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1 cup fresh bread crumbs
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2 cups shredded sharp Cheddar cheese
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1/4 cup all-purpose flour
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4 oz (115 g) fresh mozzarella cheese, drained and finely diced
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1 tsp dry mustard
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1/2 cup freshly grated Parmesan cheese