Haddock Gratin with Mushroom Cream Sauce is a delicious and elegant seafood dish. The haddock fillets are baked in a creamy mushroom sauce and topped with a crispy breadcrumb and Parmesan cheese crust. The combination of tender fish, savory mushrooms, and creamy sauce creates a flavorful and satisfying meal. Serve this gratin with a side of steamed vegetables or a fresh salad for a complete and impressive dinner.