Into the Crock Pot insert, add the cooked chicken, cream cheese, sour cream, mayonnaise, half of the shredded cheddar cheese, all of the blue cheese crumbles, and all but one tablespoon of the chopped green onions.
In a separate bowl or glass measuring cup, stir together the buffalo sauce, envelope of Ranch dip mix, garlic powder and pepper.
Pour the hot sauce mixture into the Crock Pot.
Cover and cook on high heat, stirring a couple of times, for at least one hour. Or cook on low heat for at least two hours.
Sprinkle the remaining cheddar cheese on top of the dip and continue to cook until it is completely melted. Sprinkle with the reserved chopped green onions and serve.
If the dip still seems too runny, continue to cook it longer until it reaches your desired consistency.
If you'd like an even thicker dip, make a microwave roux from 2 tablespoons of butter and 2 tablespoons of flour and add it to the dip before your start cooking it in the Crock Pot.