1. Preheat broiler.
2. To prepare salsa, combine first 4 ingredients on a baking sheet coated with cooking spray. Broil 20 minutes or until charred, stirring once. Remove from oven; cool slightly. Place tomato mixture in a food processor; add cilantro, lime juice, and pepper. Process until smooth. Set aside.
3. Preheat oven to 350°.
4. To prepare casserole, heat a large nonstick skillet over medium-high heat. Lightly coat pan with cooking spray. Add 1 cup onion, corn, zucchini, and bell pepper; sauté 6 minutes or until tender. Add chicken and next 5 ingredients (through green chiles); sauté 2 minutes or until thoroughly heated. Remove from heat.
5. Spread 1/2 cup salsa over the bottom of a 13 x 9-inch baking dish coated with cooking spray. Arrange half of tortillas over salsa. Spoon 2 cups chicken mixture evenly over tortillas. Top with 3/4 cup salsa. Sprinkle with 1/2 cup of each cheese. Repeat layers, starting with remaining tortillas and ending with remaining cheeses. Bake at 350° for 25 minutes until bubbly.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.