Preheat the oven broiler; Grease 9x13" baking dish with thin coat of butter.
Mix together Parmesan cheese, butter, mayo, lemon juice, green onion, salt, pepper, dill and Tabasco in small bowl until well blended.
Arrange fish in a single layer in baking dish.
Broil fish for 8 minutes or until it flakes with a fork.
Remove from oven and carefully spread Parmesan mixture over top. Broil 2 additional minutes, or until bubbly and lightly browned.
