Yes. Before or after baking. Let the pan come to room temperature and then tightly wrap with foil and plastic wrap. It will keep for 2 months in the freezer. When ready to eat take out of the freezer and thaw casserole. Remove the plastic wrap and replace the aluminum foil on the casserole dish if it was previously baked. Remove the foil if frozen unbaked. Thawing the pie works much better and doesn't take as long to bake or reheat. Bake at 375℉ for 40 minutes.