Place chicken in a 1-1/2-qt. slow cooker. In a bowl, combine the broth, tomatoes, tomato sauce, green pepper, onion, garlic and seasonings; pour over chicken. Cover and cook on low until chicken is tender, 3-4 hours. Remove chicken and keep warm. , Pour cooking juices into a small saucepan. Combine flour and cold water until smooth; stir into juices. Bring to a boil; cook and stir for 1 minute or until thickened. Serve with chicken and pasta. If desired, top with shaved Parmesan cheese.