1Heat oven to 400°F. Spray rectangular baking dish, 13x9x2 inches, with cooking spray. Thaw meatballs by microwaving them in microwavable bowl on High 3 to 5 minutes or until warm. Add pasta sauce; stir to coat.
2Place half of the meatballs in baking dish. Mix spinach, cream cheese and 1/2 cup of the shredded cheese. Spoon half of the spinach mixture by tablespoonfuls randomly over meatballs.
3Stir Bisquick mix and milk in medium bowl until soft dough forms. Spoon half of the dough by tablespoonfuls randomly over meatballs. Repeat layers with remaining meatballs, spinach mixture and Bisquick mixture.
4Bake uncovered about 20 minutes or until biscuits are golden brown. Sprinkle with remaining 1 cup shredded cheese. Bake about 5 minutes longer or until cheese is melted.