Creamy Blue Cheese Penne Casserole with Ham & Leeks. Tender penne is tossed in a tangy blue cheese sauce (blue cheese, cream, milk, garlic), mixed with diced ham, sautéed leeks, and peas. Topped with melted mozzarella, Parmesan, and buttery breadcrumbs for a golden crust. A comforting blend of rich, savory, and cheesy flavors in every bite.