1. Preheat oven to 325 degrees F. Spray 8x8-inch baking dish and medium skillet with cooking spray. Heat skillet over medium-high heat. When hot, add bell pepper and onion; cook 5 minutes or until tender, stirring several times.
2. Stir in broth, soup, undrained tomatoes and chicken; blend well. Bring to a boil; remove from heat.
3. Layer 1/3 each of the tortilla pieces, chicken mixture and cheese evenly in baking dish. Repeat layers twice more. Bake uncovered 40 minutes or until hot and bubbly.