Preheat oven to 400 degrees. Lightly spray baking sheet with nonstick cooking spray. Unroll pizza dough on baking sheet; pat into 12x9-inch rectangle.

Combine chicken and barbecue sauce in medium bowl until well blended. Spread chicken mixture lengthwise down center of dough, leaving 2 1/2 inch border. Sprinkle with cheese and 2 green onions. Fold long sides of dough over filling; press edges to seal. Sprinkle with remaining green onion.

Bake 19 to 22 minutes or until golden brown and heated through. Let stand 10 minutes before slicing.