Heat the oven to 350°F. Heat the oil in a 10-inch skillet over medium-high heat. Add the zucchini and onion and cook for 5 minutes or until they're tender. Stir in the spinach and corn.
Try an enchilada casserole for your next dinner ... mixture in a 9-by-13-inch baking dish coated with cooking spray. Layer with 1/3 of the tortillas, half of the chicken and 1/3 of the cheese.