INGREDIENTS
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1 lb rigatoni pasta (or elbow macaroni)
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1 tbsp vegetable oil
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½ cup chopped onion
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2 tbsp butter
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1½ cups skim milk
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2 tbsp all-purpose flour
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¼ cup shredded Gruyere cheese
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¼ cup shredded Pecorino Romano cheese
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¾ cup shredded light white cheddar cheese
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¼ tsp salt
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½ cup Panko bread crumbs
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