In medium saucepan, melt butter and stir in flour to make a thin-ish paste. Cook 1 to 2 minutes, stirring constantly, then whisk in milk a little at a time to make a white sauce. Bring to a boil, then reduce heat and simmer. Remove pan from heat and stir in cheese or keep pot on low heat and stir constantly until cheese is melted and a cheesy sauce is attained. Add pasta.
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