Cook pasta in large saucepan as directed on package, omitting salt and adding spinach to the boiling water for the last minute. Meanwhile, cook and stir chicken and garlic in large skillet sprayed with cooking spray on medium-high heat 3 min. or until chicken is browned. Stir in pasta sauce and tomatoes; bring to boil. Simmer on medium-low heat 3 min. Remove from heat; stir in cream cheese product until melted.