01 - Preheat oven to 375°F. Grease an 8x8-inch baking dish with cooking spray or butter.
02 - In a large mixing bowl, combine softened cream cheese, sour cream, and buffalo wing sauce. Whisk until completely smooth and creamy.
03 - Add shredded chicken, garlic powder, onion powder, black pepper, and salt to the bowl. Mix thoroughly to coat all pieces evenly.
04 - Fold in half of the shredded mozzarella and cheddar cheeses until evenly distributed throughout the chicken mixture.
05 - Spread the chicken mixture evenly into the prepared baking dish. Sprinkle the remaining mozzarella and cheddar cheeses over the top.
06 - Bake for 30 to 35 minutes until the cheese is melted, bubbly, and golden brown on top.
07 - Remove from oven and let stand for 5 minutes to set. Top with sliced green onions, blue cheese crumbles, and chopped parsley if desired.
08 - Serve hot alongside celery sticks, tortilla chips, or a crisp green salad.