Spooky Stuffed Shells

Heat oven to 375°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Cook and drain pasta shells as directed on package. Rinse with cold water to cool; drain.

Meanwhile, in medium bowl, stir together chicken, spinach, cream cheese, Parmesan cheese and pesto until thoroughly blended.

Spoon 2 cups of the pasta sauce into bottom of baking dish. Spoon 2 heaping tablespoons chicken mixture into each pasta shell. Arrange shells, filled sides up, on sauce in baking dish. Spoon remaining pasta sauce over stuffed shells.

Cover dish with foil; bake 25 minutes. Sprinkle with mozzarella cheese. Bake uncovered 5 minutes longer or until cheese is melted.