1. Preheat oven to 350°. Melt butter in a large skillet over medium-high heat. Add onion, and sauté 6 to 7 minutes or until tender. Add bell pepper and garlic, and sauté 3 to 4 minutes. Stir in chicken broth, cream of mushroom soup, and next 5 ingredients. Cook, stirring occasionally, 8 minutes.
2. Layer half of chicken in a lightly greased 13- x 9-inch baking dish. Top with half of soup mixture and 1 cup Cheddar cheese. Cover with half of corn tortilla chips. Repeat layers once. Top with remaining 1 cup cheese.
3. Bake at 350° for 55 minutes to 1 hour or until bubbly. Let stand 10 minutes before serving.
*1 tsp. chili powder and 1/8 tsp. ground red pepper may be substituted for Mexican-style chili powder.