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Preheat your oven's broiler.
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Grease a broiling pan or line pan with aluminum foil.
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In a small bowl, mix together the Parmesan cheese, butter, mayonnaise and lemon juice.
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Season with dried basil, pepper, onion powder and celery salt. Mix well and set aside.
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Arrange fillets in a single layer on the prepared pan.
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Broil a few inches from the heat for 2 to 3 minutes.
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Flip the fillets over and broil for a couple more minutes.
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Remove the fillets from the oven and cover them with the Parmesan cheese mixture on the top side.
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Broil for 2 more minutes or until the topping is browned and fish flakes easily with a fork. Be careful not to over cook the fish.