How can you serve a chicken casserole the next day without it being too dry?

To keep a chicken casserole moist when serving it the next day, add a splash of chicken broth or cream before reheating to restore moisture. Cover the casserole with foil to retain steam while baking or microwaving, preventing it from drying out. Additionally, consider adding fresh herbs or a drizzle of olive oil just before serving to enhance flavor and moisture.