Prepare pizza crust according to package directions.

Toss chicken with 1/2 cup (125 mL) barbecue sauce; set aside.

Divide dough into 2 portions. On lightly floured work surface, roll out each portion into 12- x 17-inch (30 x 42 cm) rectangle. Transfer rectangles onto 2 parchment paper–lined sheet trays.

Leaving 1/2-inch (1 cm) border all around, spread pizza sauce over each crust in circular motion. Sprinkle with 1 cup mozzarella. Scatter with barbecue chicken. Top with remaining mozzarella, green pepper and onion slices.

Bake according to package directions. Drizzle pizzas with remaining barbecue sauce. Let cool for 5 minutes before serving.