Preheat oven to 450°F. Place frozen fish in 13 x 9 baking dish; drizzle with dressing.
Bake 25 minutes. Top with mushrooms and cheese. Bake 5 minutes or until cheese melts and fish flakes easily with a fork.
4 servings
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.