PREHEAT oven to 375ºF. Mix cream cheese, spinach, 1 cup of the mozzarella cheese and 3 Tbsp. of the Parmesan cheese until well blended; spread evenly onto chicken breasts. Starting at one of the short ends of each breast, roll up chicken tightly. Secure with wooden toothpicks, if desired. Set aside.

BEAT egg in shallow bowl or pie plate. Mix remaining 3 Tbsp. Parmesan cheese and the cracker crumbs in separate shallow bowl or pie plate. Dip chicken bundles in egg, then roll in crumb mixture. Place, seam-sides down, in 13x9-inch baking dish sprayed with cooking spray.

BAKE 30 min. or until chicken is cooked through (170ºF). Remove and discard toothpicks, if using. Serve topped with the pasta sauce and remaining 1/4 cup mozzarella cheese.