Do you cook a casserole longer if the recipe is doubled?

It depends on the type of casserole and the ingredients used. In general, if you double the ingredients in a casserole recipe, you may need to increase the cooking time by about 15-20 minutes. However, some casseroles, such as those made with pasta or rice, may require less additional cooking time, while others, such as those made with large pieces of meat or vegetables, may require more. It is always a good idea to check the casserole at the recommended cooking time and adjust as needed.