Heat oven to 375°F. Lightly grease large cookie sheet with shortening or cooking spray. In medium bowl, mix chicken and barbecue sauce.
Separate dough into 8 rolls. Press or roll each to form 4 1/2-inch round; place on cookie sheet. Place about 1/4 cup chicken mixture on each round. Top with 1 tablespoon each of onion, cheese and bell pepper.
Bake 15 to 17 minutes or until cheese is melted.