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