Preheat oven to 450 degrees. Grease a standard pizza pan (I use a 15x17 Wilton pizza pan with the holes in the bottom to help get the bottom of the crust golden and crisp). Press the pizza dough into the pizza pan. Spread the 1/2 cup barbecue sauce onto the dough as a sauce. Top with shredded mozzarella.
In a bowl, season the shredded chicken with salt and pepper and toss with 2 tablespoons of barbecue sauce. Sprinkle the chicken over the cheese. Follow with cilantro and red onion slices. Bake 15-17 minutes, or until cheese is melted and crust is golden and cooked through in the center. Slice and serve.