chopped brocolli (optional)
In saucepan, boil the potatos, celery, onion,brocolli (if desired) and carrots in the 2 cans of chicken broth until desired texture.
In large stock pan, melt margarine. Add cornstarch and milk. Stir until thick.
Add vegetables and broth, ham, velvetta, and 1/2 c. water (or more depending how thick or thin you like your soup). Heat, stirring often. Do not boil.