1Heat oven to 400°F for dark or nonstick pan (425°F for all other pans). Spray 15x10x1-inch pan with cooking spray.
2Unroll dough in pan; starting at center, press dough into 15x10-inch rectangle. Bake 9 to 10 minutes or until golden brown.
3Meanwhile, in medium bowl, mix chicken and barbecue sauce until chicken is coated with sauce.
4Sprinkle 1 cup of the cheese over partially baked crust. Spoon and carefully spread chicken mixture evenly over cheese. Top with red onion and remaining 1 cup cheese. Bake 8 to 11 minutes or until cheese is melted. Sprinkle with cilantro. To serve, cut into 6 rows by 3 rows.