Keep Friendsgiving Casserole By Joanna Gaines in an airtight glass container or covered baking dish for up to 4 days in the refrigerator. For freezing, wrap the unbaked casserole tightly with plastic wrap and foil, then freeze it for up to 2 months. Thaw overnight before baking so the creamy filling warms evenly. Reheat portions at 350°F for 15 to 20 minutes until the center reaches a hot temperature. Add a few fresh bread pieces on top before reheating if the crust needs more texture. Discard leftovers if you notice sour smells, unusual liquid separation, or changes in texture.