Preheat oven to 375° degrees. Spray a 1-quart baking dish with non-stick cooking spray.
In a medium size mixing bowl, combine the powdered ranch mix, chicken, softened cream cheese, bleu cheese, buffalo sauce, shredded cheese and sour cream. Stir until blended.
Spoon the cheesy chicken dip mixture into the prepared baking dish.
Bake uncovered for 20 minutes or until mixture is hot and bubbly. If desired place under the broiler for 2-3 minutes until the top is golden brown.
Garnish with additional blue cheese and thinly sliced green onions. Serve with crackers, tortilla chips, carrots, celery and/or sliced baguette. Enjoy!