INGREDIENTS
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1 (8 ounce) elbow 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, and divided (about 4 1/2 cups)
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1 cup soft breadcrumbs (4 slices, crust removed)
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1/4 cup butter, melted