Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
In a saucepan melt margarine. Blend soup mix with flour and milk and add to skillet; stir. Bring to a boil. Reduce heat and simmer 10 minutes. Stir in cheese. Toss with cooked pasta.
