Preheat the oven to 350°F. Lightly grease a small baking dish or oven-safe skillet.
Mix the creamy base: In a large bowl, combine the softened cream cheese, Greek yogurt, ranch seasoning mix, and Worcestershire. Stir or beat with a hand mixer until smooth.
Add chicken, sauce, and cheese: Fold in the shredded chicken, buffalo sauce, cheddar, and mozzarella until fully combined.
Assemble: Spread the mixture into the prepared dish. Top with extra cheese if desired.
Bake for 20–25 minutes, or until the dip is hot, bubbly, and lightly golden around the edges.
Serve: Garnish with scallions and an extra drizzle of buffalo sauce. Enjoy warm with tortilla chips, pretzels, celery sticks, or crackers!