Spray 4- to 5-quart slow cooker with cooking spray. Place chicken in cooker. Top with bacon, carrots, potatoes, marjoram and gravy.
Cover; cook on Low heat setting 6 to 8 hours.
Gently stir thawed green beans into chicken mixture. In medium bowl, mix melted butter and stuffing; spoon over chicken mixture. Increase heat setting to High; cover and cook 15 minutes longer.