1. Preheat oven to 450°.
2. Heat a saucepan over medium heat. Coat pan with cooking spray. Add onion; sauté 2 minutes or until translucent. Stir in chicken, stock, marinara, and barbecue sauce; cook 3 minutes or until thoroughly heated. Remove pan from heat.
3. Spread about 1/2 cup chicken mixture over each crust; top evenly with mozzarella cheese. Place pizzas directly on oven rack; bake at 450° for 9 minutes or until cheese melts. Top with green onions and pepper. Cut each pizza into 4 wedges.
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