Preheat broiler. Line baking dish with aluminum foil; spray lightly with cooking oil. In a small bowl mix butter, Parmesan cheese, mayonnaise and lemon. Add in salt, pepper and onion powder. Place fillets on baking dish. Broil for 2 – 3 minutes. Flip the fish and broil for 2 – 3 minutes more. Check to see if fish is starting to flake with a fork (if the fish is still fairly firm, put it back in to broil for about 2 minutes). Top the fish evenly with the Parmesan cheese mixture. Broil for about 2 more minutes. Topping will brown slightly, and fish should flake easily when punctured with a fork.
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