Preheat oven to 425 degrees F. Spray a large baking sheet with nonstick cooking spray.
Add red and yellow bell pepper, zucchini and carrot pieces to baking sheet. Drizzle with olive oil and sprinkle with Italian seasoning, salt and pepper. Toss lightly to coat. Bake for 20 minutes.
Remove baking sheet from oven and toss in fresh corn, onion and garlic. Drizzle with a little more olive oil. Bake an additional 15 minutes, or until vegetables are lightly charred and tender.
Remove dish from oven and sprinkle vegetables with cheese and chopped basil. Serve hot or cold.