01 - Place shredded chicken, cream cheese, ranch dressing, buffalo sauce, cheddar cheese, and mozzarella cheese into the slow cooker.
02 - Stir all ingredients together until well combined and evenly distributed.
03 - Cover and cook on LOW setting for 2 hours, stirring once halfway through cooking, until the dip is hot and bubbly throughout.
04 - Stir well before serving to ensure all ingredients are fully incorporated.
05 - Sprinkle chives or green onions and blue cheese on top if desired. Serve warm with tortilla chips, celery sticks, or carrot sticks.