Advance preparation: Combine soup, cheese spread, and milk.
Cook onion in butter till tender.
Cook broccoli according to package directions till almost tender; drain.
Add onion, broccoli, ham, rice, and Worcestershire to soup mixture.
Turn into two 1 1/2-quart casseroles.
Seal, label, and freeze up to 2 months.
Before serving: Bake, covered, at 400° for 1 1/2 hours.
Uncover; bake 30 minutes more.