Preheat oven to 350°.
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.
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