Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded chicken, Greek yogurt, softened cream cheese, shredded cheddar cheese, buffalo sauce, ranch dressing, garlic powder, onion powder, salt, and black pepper. Mix until well combined.
Transfer the mixture to a baking dish and spread it evenly.
Bake in the preheated oven for 20-25 minutes, or until the dip is hot and bubbly.
Remove from the oven and let it cool for a few minutes. Garnish with chopped green onions or celery if desired.
Serve warm with tortilla chips, celery sticks, or crackers.