Yes, you can freeze a mini casserole. Most mini casseroles can be frozen before or after cooking. If you want to cook the casserole before freezing, make sure it is fully cooked and cooled before freezing. If you want to freeze the raw casserole, make sure it is well-covered so it doesn't get freezer burn. Here are some tips for freezing a mini casserole: -Freeze in small portions so they thaw quickly and evenly. -Label the container with the date and contents. -Thaw in the fridge overnight