Spray 5- to 6-quart slow cooker with cooking spray. In large bowl, mix all ingredients except tortillas, cheese and cilantro. Tear tortillas into 1-inch pieces; layer one-third of tortilla pieces in slow cooker. Top with one-third of the chicken mixture and 2/3 cup of the cheese. Repeat layers twice.
Cover; cook on Low heat setting 3 hours 30 minutes or until bubbly and edges are golden brown. Uncover; cook 30 minutes longer. Sprinkle with cilantro.