Meanwhile, in 2-quart saucepan, melt butter over medium heat. Add onion; cook 3 minutes, stirring occasionally. Stir in flour; cook and stir 30 seconds. Slowly stir in broth; heat to boiling. Cook 3 to 4 minutes, stirring frequently, until thickened. Remove from heat; stir in cheese. Gently stir in cooked pasta, chicken, tomatoes, and parsley. Spoon into baking dish.
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