In a medium bowl, combine the whipped cream cheese, Ranch seasoning, one cup of the shredded cheddar cheese and half the sliced green onions. Stir well until smooth. Spread the mixture evenly into the bottom of a 6-quart slow cooker insert.
In a separate clean bowl, stir together the cooked chicken with Buffalo sauce and melted butter until well combined. Spread evenly over top of the cream cheese mixture.
Sprinkle the remaining cheddar cheese on top of the buffalo chicken layer. Cover and cook on high power for one hour or low power for two hours. Drizzle some blue cheese dressing on top of the dip. Then garnish with the remaining green onions. Serve with celery and crackers. Or whatever else sounds good to you!