Many people are surprised when they learn how to reheat a casserole in the oven. Although many people will instinctively know how long to cook a casserole, very few people can tell you what temperature it needs to be cooked at in order for it to be safe to eat. The safest way to cook a casserole is in a glass baking dish with a lid. If you are making a casserole that will be served cold, make sure that it is cooked well through but not uncooked before serving.
How long to cook a casserole in ovens with covers depends on how large the casserole is and how cold the casserole is when reheating is started. A casserole not immediately eaten upon removal from the oven will typically need to be reheated. To reheat a casserole in an oven:
- Preheat the oven to 325°F-350°F.
- moisten the top of the casserole a tablespoon or two to help generate steam.
- covered the casserole dish.
- Place casserole on the center shelf of the oven and reheat at 325°F-350°F for 20-30 minutes. This cooking time may need to be shortened for smaller casseroles.
- Check the casserole with a food thermometer about every ten minutes until the center of the casserole achieves a food safety temperate of 165°F.
- Remove the casserole from the oven and server immediately.