Parmesan Ham Pasta

16 oz. bow tie pasta
2 c. cubed fully cooked ham
1 can 4 oz. mushroom pieces (I omit this ingredient)
1/2 c. butter
1/2 c. flour
1/2 tsp. salt
2 c. milk
1 pkg. 10 oz. frozen chopped spinach, thawed and squeezed dry
1 c. shredded Parmesan cheese

Cook pasta according to package directions. Meanwhile, in a large skillet, saute ham and mushrooms in butter. Stir in flour and salt until blended. Gradually add milk. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat. Stir in spinach and cheese. Cook and stir until cheese is melted. Drain pasta; stir into the ham mixture.