Coat two 12-inch pizza pans with nonstick cooking spray; sprinkle with cornmeal. Divide the bread dough in half; roll each portion into a 12-inch circle. Transfer to prepared pans. Build up edges slightly; prick dough thoroughly with a fork. Bake at 425 degrees for 12 minutes or until lightly browned.
Meanwhile, in a skillet, cook the beef, onion, yellow pepper and garlic over medium heat until meat is no longer pink; drain. Stir in refried beans, salsa, chilies and chili powder; heat through. Spread over the crusts; sprinkle with cheese. Bake 6-7 minutes longer or until cheese is melted. Top with tomatoes and lettuce; serve immediately.