Preheat oven to 400°C. Spray baking sheet with cooking spray; set aside.
Unroll pizza dough; spread barbecue sauce evenly over dough. Sprinkle with cheese, chicken and onion. Roll up, starting with a long edge, to enclose filling. Cut with serrated knife into 8 pieces.
Place roll-ups, cut-side up, on baking sheet. Bake 15 minutes or until golden brown.