Saute margarine, mushrooms and onion. Blend in flour. Add chicken broth, half and half, and grated cheese, stirring until smooth and thick. Add pepper, lemon juice. Cook noodles, drain and add with ham to the above mixture. Bake in 2 quart covered casserole, topping mixture with parmesan cheese at 400 degrees for 20-30 minutes. Lower heat and simmer uncovered for 10 minutes.
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