This chicken and leek casserole is a delicious and comforting dish perfect for a cozy dinner for two. Tender chicken pieces are cooked with leeks, carrots, and mushrooms in a creamy sauce, then topped with a crispy breadcrumb and Parmesan cheese crust. The flavors meld together beautifully, creating a hearty and satisfying meal. Serve this casserole with crusty bread or mashed potatoes for a complete and comforting dinner.