Heat oil in a nonstick skillet over medium- high heat. Add onion, pepper, and celery; sauté 5 minutes. Add corn and next 5 ingredients. Sauté 3 minutes; set aside. 2. Preheat oven to 350°.
Preheat oven to 350°.
Combine milk, water, and salt in a saucepan; bring to a boil over high heat. Add cornmeal, reduce heat, and simmer 10 minutes, stirring constantly.
Spoon vegetable mixture into an 11 x 7-inch baking dish coated with cooking spray. Top with cornmeal mixture; sprinkle with cheese. Bake at 350° for 30 minutes or until bubbly. Let stand 10 minutes.