Preheat the oven to 375 degrees. Spray a pie baking dish with non-stick cooking spray.
In a large saucepan, combine the buffalo sauce, cream cheese, garlic powder, onion powder, and dressing. Cook over medium high heat, stirring until all smooth and melted together.
Stir in 1 cup of the sharp cheddar cheese until melted, then stir in the shredded chicken.
Pour the mixture in to your prepared pie dish.
Sprinkle with the remaining sharp cheddar and the mozzarella.
Bake at 375 for 15 minutes.
Garnish with chopped chives or green onions before serving. Serve with tortilla chips, crusty bread, crackers, or carrots and celery!