If you are preparing this dish ahead of time and would like to freeze it, transfer completely cooled casserole to a freezer-friendly container. Freeze for up to three weeks. Transfer frozen casserole from the freezer to the refrigerator at least 12 hours before planning to reheat. When ready, gently stir the casserole and return to a baking dish. Bake at 350 for 15-20 minutes or until bubbly and hot.