Add the rest of the ingredients and cook until the cheese is melted.
Place in a 2-quart casserole dish.
Bake at 350 (uncovered) for 1 hour.
To make ahead and freeze: Mix all the ingredients together (start with your cooked rice, not raw) and pour into two or even three small casserole dishes, cover, label and freeze.
If you are thawing overnight, just bake for an hour. If cooking from frozen, add about ten minutes, check for doneness.