1Spray 5- to 6-quart slow cooker with cooking spray. Place turkey in cooker. In small bowl, mix butter, lemon peel and garlic; rub over turkey breast. Sprinkle with thyme and lemon-pepper seasoning.
2Cover; cook on Low heat setting 6 to 7 hours.
3Remove turkey from cooker; cover turkey to keep warm. If desired, skim fat from juices in cooker. Pour juices from cooker into 4-cup microwavable measuring cup. In small bowl, mix cornstarch and water until smooth; stir into juices in cup. Microwave uncovered on High 2 to 3 minutes, stirring every minute, until mixture thickens. Serve with sliced turkey.