Cook ziti according to package directions without salt; drain well.

Preheat oven to 375°F.

Coat a Dutch oven or large pot with cooking spray.

Add chopped onions, minced garlic, finely chopped carrots, chopped green pepper, and chopped zucchini.

Sauté over medium heat for 10 minutes, stirring often.

Stir in diced tomatoes, tomato sauce, and oregano.

Bring to a boil; reduce heat to low, simmering 15 minutes.

Stir in rinsed and drained black beans, thawed frozen corn, and chopped green chilies.

Cook for 5 minutes.

Remove from heat; add pasta and cheeses, tossing gently.

Coat a 9-inch square baking dish with cooking spray.

Spoon mixture into dish.

Bake for 30 minutes or until heated through.

Let stand 5 minutes before serving.