Since casseroles are a part of the holidays (Thanksgiving and Christmas), many people are left with the problem of "What do I do with it now?" Well, a little bit of research on my favorite subject comes up with some storage tips.
You can store casseroles made with eggs and quiches (with fillings) in the refrigerator for three to four days.
You can freeze casseroles and quiches after baking them. Quiches will last one to two months while casseroles have a slightly longer lifespan of two to three months.
What this will do to the texture of the casserole or quiche really depends on the filling. If you are after al dente vegetables, this is probably not the best plan.
So, there you have it, you can now enjoy Aunt Edna's casserole for days or months after the holiday.