INGREDIENTS
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3 tablespoons butter
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1 small yellow onion, chopped
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4 cups frozen shredded hash browns
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1 pound bulk sausage, mild, hot or sage
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2 1/4 cups whole milk
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8 large eggs
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1 teaspoon salt
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1/4 teaspoon black pepper
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1/4 teaspoon freshly grated nutmeg
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2 tablespoons Dijon mustard
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8 cups cubed French or Italian bread, crusts removed
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2 cups (1/2 pound) grated Cheddar
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2 cups (1/2 pound) freshly grated Parmesan