Cheesy Mushroom-Fish-Bake

4 frozen haddock fillets (1 lb.)
2 Tbsp. zesty Italian dressing
1 c. sliced fresh mushrooms
1/2 c. shredded Mozzarella cheese
1 Tbsp. chopped fresh parsley

Place frozen fish in 13-inch by 9-inch baking dish; drizzle with dressing. Bake 25 minutes in preheated 450° oven. Top with mushrooms and cheese. Bake five minutes or until cheese is melted and fish flakes easily with fork. Sprinkle with parsley. Makes four servings. (Halibut or cod fillets may be used.)