Heat oven to 350. Spray baking dish; square 8x8 or oval dish, with cooking spray. Cook pasta as directed and drain.
Melt butter in a saucepan over medium heat. Stir in flour. Gradually stir in broth. Heat to boiling, stirring constantly; remove from heat. Stir in half-and-half and 1/2 cup grated parmesan cheese. Stir in chicken, tomatoes and bacon.
Add pasta to chicken mixture; toss gently to mix well. Spoon into baking dish. Sprinkle with 3 tablespoon of parmesan cheese. Bake uncovered about 30 minutes or until hot in the center.
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