For freezing, I use inexpensive aluminum foil 9x9 pans so I don't end up with all my baking dishes in the freezer! 1. Assemble the casserole as per the instructions but do not add the cracker crumb topping. 2. Wrap the casserole tightly in tinfoil, then slide the casserole dish into a freezer bag. 3. Be sure to label the bag with the date, name of the recipe, and baking instructions.