INGREDIENTS
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1 (8-ounce) package elbow macaroni (about 2 cups uncooked macaroni)
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2 cups milk
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1/4 cup all-purpose flour
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1 teaspoon onion salt
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2 (10-ounce) blocks sharp Cheddar cheese, shredded (about 4 1/2 cups) and divided*
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1 cup soft breadcrumbs (4 slices, crusts removed)
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1/4 cup butter or margarine, melted