Creamy Haddock Fish Pie is a comforting and delicious dish made with flaky haddock fillets, creamy sauce, and topped with mashed potatoes. This classic British recipe is perfect for a cozy family dinner or a special occasion. The haddock is poached in milk to infuse it with flavor, then combined with a rich and creamy sauce made from butter, flour, milk, and cheese. The dish is finished off with a layer of creamy mashed potatoes and baked until golden and bubbling. Serve this hearty fish pie with a side of steamed vegetables for a complete meal.