01 - Preheat oven to 375°F.
02 - In a large mixing bowl, combine softened cream cheese, sour cream, ranch dressing, Buffalo sauce, garlic powder, and black pepper. Mix until smooth and creamy.
03 - Fold in shredded chicken, cheddar cheese, and mozzarella cheese until evenly distributed throughout the mixture.
04 - Spread mixture evenly into a 9-inch oven-safe baking dish.
05 - Bake for 20 to 25 minutes until dip is hot and bubbly with a golden brown top.
06 - Remove from oven and let cool for 5 minutes. Garnish with sliced green onions if desired.
07 - Serve warm with tortilla chips for dipping.