#1. Heat oven to 400°F. Spray bottom of 13x9-inch (3-quart) baking dish with cooking spray. Place taco shells standing up and together in dish set aside. #2. In 10-inch nonstick skillet, cook chicken, taco seasoning mix, water and chiles over medium heat 5 to 6 minutes, stirring frequently, until chicken is heated through. Remove from heat. #3. To assemble, spread about 2 tablespoons refried beans in bottom of each shell. Top each with heaping 1/4 cup chicken mixture and 2 tablespoons shredded cheese. Bake 5 to 7 minutes or until cheese is melted. Top with guacamole, tomatoes and green onions.