Heat oil in 4 quart pot over medium heat. Add onion, garlic and chili powder; saute for 5 minutes. Add green and red peppers; saute 5 minutes. Add zucchini, squash, oregano and ground red cayenne pepper; saute for 5 minutes. Add tomatoes; cook 10 min. stir in corn, black beans and salt; cook for 5 minutes.