Preheat the Oven: Set your oven to 350°F (175°C).
Mix the Chicken: In a medium-sized bowl, combine the shredded chicken, buffalo sauce, and ranch dressing. Stir until well mixed.
Prepare the Creamy Base: In a separate bowl, mix the cream cheese, sour cream, onion salt, and garlic powder using an electric mixer until smooth and creamy.
Combine Everything: Add the buffalo chicken mixture to the cream cheese mixture and stir until fully incorporated.
Transfer to a Baking Dish: Spread the mixture evenly into a 9x9 baking dish. Smooth out the top with the back of a spoon.
Top and Bake: Sprinkle shredded cheese over the top and bake for 30 minutes, or until the cheese is melted and bubbly.
Garnish and Serve: Remove from the oven and top with diced green onions. Serve hot with celery sticks, tortilla chips, or crackers.