To Store: Store leftover cottage pie covered in the refrigerator for 3-5 days. Adjust storage times based on how fresh your ingredients were to begin with and take care to remember that leftover meat should not be stored for more than 5 days after it was originally cooked.
To Freeze: To freeze cottage pie, bake it as directed in a freezer-safe aluminum pan and allow it to cool completely. Double wrap it in plastic wrap and tinfoil and store it in the freezer for up to 2 months. To reheat, place the frozen pie in the oven at 350ºF for 1 1/2 hours.