Preheat oven to 475°F with a pizza stone or inverted sheet on middle rack.
Dust a sheet of parchment with cornmeal. Stretch dough into a 12–13 inch round.
Brush dough lightly with olive oil, leaving a thin border for the crust.
Toss chopped chicken with a spoonful of BBQ sauce to coat.
Spread remaining BBQ sauce over dough. Sprinkle on mozzarella evenly.
Distribute BBQ chicken, red onion, and blue cheese. Season with salt, pepper, and garlic powder.
Slide parchment onto the hot stone. Bake until crust is browned and cheese bubbles, 12–14 minutes.
Rest 2 minutes. Drizzle with a little BBQ sauce, scatter cilantro, slice, and serve.