In a large bowl, combine all ingredients and mix well.
Divide mixture into 4 ziptop freezer bags. Label and seal them tightly.
Freeze the bags flat.
Thaw one bag overnight (or for 8 hours) in the refrigerator.
Dump the contents of the bag into a greased casserole dish (one bag fills an 8×8″ pan; two bags fills a 9×13″ pan)
Sprinkle with additional shredded cheese, if desired.
Bake at 350ºF for 25-30 minutes, or until heated through and bubbly.
