This vegetarian chili is a quick and easy meal that can be made in under 30 minutes. Simply sauté diced onions, bell peppers, and garlic in a pot with olive oil. Add canned diced tomatoes, black beans, and corn, and season with chili powder, cumin, and salt. Let the chili simmer for 15-20 minutes, and serve with shredded cheese and sour cream for a delicious and hearty meal.