A casserole dish is a deep, oven-safe container used for baking and serving a variety of meals. Typically made from materials like glass, ceramic, or metal, these dishes come in various sizes and shapes, allowing for versatility in cooking. Casseroles often combine ingredients such as meats, vegetables, and grains, making them a convenient one-dish meal option. Casserole dishes are designed to retain heat and distribute it evenly, ensuring that food cooks thoroughly. They often feature a lid, which helps to keep moisture in during cooking. Popular examples of casserole dishes include lasagna, shepherd's pie, and green bean casserole.