Make Ahead: Most of the prep work can be done ahead of time, so you can assemble this in a flash. Leftovers: Any leftovers can be stored in an airtight container in the fridge for up to 4 days.  Freeze: You can freeze any leftovers in a freezer container for up to 1 month. Thaw in the fridge overnight and reheat in the oven at 325°F until heated through.