Baked Cod Livornese

1. Preheat oven to 400F.
2. In a 10 inch skillet heat oil; add onion and garlic and saute until onion is translucent, about 1 min. Add mushrooms and cook until mushrooms are just tender, about 2 min. ; add wine and bring to a boil.
3. Add tomatoes and seasonings and cook, stirring occasionally until sauce thickens, about 2 min. In a shallow 1 quart flameproof casserole arrange fillets and top with sauce; sprinkle with cheese and bake until fish flakes easily at the touch of a fork, 15 to 20 min. Using a slotted pancake turner, carefully remove fish from casserole to serving platter; keep fish warm.
4. Place casserole over med. heat and cook remaining pan juices until reduced and thickened, about 2 min. ; pour over fish and sprinkle with parsley.