Combine parmesan cheese and paprika set aside.
Season fish with salt & pepper. Melt butter in broiler safe 13 X 9 baking dish until butter melts & starts turning brown. Place fish in hot butter skin side up & bake on middle rack for 10 minutes.
Carefully flip fish & baste with pan juices. Sprinkle with lemon juice, parmesan cheese mixture & bake 5 more minutes.
Remove from oven, increase temperature to broil. Place on top rack 2 to 3 minutes until golden brown.