01 - Preheat the oven to 375°F (190°C).
02 - In a large mixing bowl, blend softened cream cheese, sour cream, and ranch dressing until smooth.
03 - Mix in buffalo wing sauce, shredded chicken, half of the shredded cheddar cheese, and blue cheese if using.
04 - Spread the mixture evenly into a 9-inch (23 cm) baking dish or oven-safe skillet.
05 - Sprinkle the remaining shredded cheddar cheese over the top.
06 - Bake for 20 to 25 minutes until hot and bubbly.
07 - Remove from oven and let cool for 5 minutes. Garnish with sliced green onions.
08 - Serve warm with celery sticks and chips for dipping.