1 lb. mahi mahi (can use any white fish)

1/2 c. olive oil
1/2 c. soy sauce (I prefer Kikkoman)
1 tbsp. onion powder
1/2 tsp. pepper
2 cloves garlic, crushed
1/4 - 1/2 c. finely chopped onion
8 oz. sliced mushrooms

Combine marinade.

Wash fish and place in zip lock bag. Pour marinade over fish and move fish around so marinade covers and surrounds fish. Marinade in refrigerator for 1 to 4 hours. Spray glass casserole dish with cooking spray. Pour fish and marinade over sliced mushrooms in casserole. Bake in 350 degree oven until fish is flaky.