In a slow cooker at least 4 quarts in size, add the cooked shredded chicken, cream cheese, ranch dressing mix, garlic powder, shredded cheese, buffalo sauce, and sour cream. Stir well to combine.

Cover the slow cooker and cook on low for 1 to 2 hours, or until the dip is hot and bubbly.

When ready, stir well.

Serve with chips or celery, topped with optional blue cheese crumbles and green onions.