INGREDIENTS
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Ingredients
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4 cups uncooked elbow macaroni
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3/4 cup finely chopped onion
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3/4 cup butter, divided
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6 tablespoons all-purpose flour
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4-1/2 cups milk
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4 cups (16 ounces) shredded sharp cheddar cheese
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1 teaspoon ground mustard
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1-1/2 teaspoons salt
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1/4 teaspoon pepper
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3/4 cup dry bread crumbs