Preheat oven to 375 degrees.
Combine cooked chicken, grilled red onion, cream cheese, 1 1/2 cups mozzarella cheese, BBQ sauce and ranch dressing. Mix well and pour into a 1 1/2 quart baking dish.
Sprinkle remaining 1/2 cup of mozzarella cheese on top and bake for 25-30 minutes until hot and bubbly.
Drizzle with BBQ sauce and ranch dressing. Garnish with scallion and cilantro to serve.