Generally, casseroles with grains, rice or pasta that will cook during the baking process are usually covered, for at least part of the time. Casseroles made of cooked ingredients are usually baked uncovered. If you like a crisper, browner top, be sure the casserole is uncovered for at least part of the bake time.
Can you bake casserole dish with lid?
Whether or Not It Has a Lid
And because the lid is ceramic, it can be used in the oven to cook a covered casserole, should a recipe require it. Lids made of plastic are fine for transport and storing leftovers, but can't be put on a blazing-hot casserole dish and definitely aren't oven-safe.
What do you cover a casserole dish with in the oven?
Generally we would use a tightly fitting pan lid for covering a pan or pot in the oven, as long as the lid and handle are oven safe. If the pan you are using does not come with a suitable lid then you may need to use a layer, or even a double layer, of foil to cover the pan.