For an extra golden crust, brush the top with an egg wash (1 egg beaten with 1 tablespoon of water) before baking. Feel free to customize the vegetables to your liking. Celery, mushrooms, or green beans would also be delicious additions. To prevent the bottom crust from becoming soggy, blind bake it for 10 minutes before adding the filling. When freezing the assembled pie, wrap it tightly in plastic wrap and then foil to prevent freezer burn. It can be frozen for up to 3 months. Bake from frozen, adding an extra 15-20 minutes to the baking time.