Place flour, salt and pepper in shallow dish (or on wax paper). Place milk in shallow dish. Combine crumbs and walnuts in another dish.
Dredge fish lightly in flour, then dip in milk. Dredge in crumb-walnut mixture.
Place fish in a lightly greased baking dish and brush lightly with butter, so that nuts are not moved.
Bake at 450°F until outside is lightly browned and crispy, about 15 minutes.
Contributed by Joyce Taylor