Preheat oven to 350 degrees. In a large bowl, mix alfredo, chicken, broccoli, and cheeses. Spoon mixture into pasta shells. Grease 13 x 9 baking dish with butter or cooking spray. Evenly spread spaghetti sauce on bottom of baking dish (if you like). Arrange shells in baking pan. Cover with foil and bake 35 minutes or until heated through.
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