Heat oil over medium heat in a 5-quart heavy pot with lid. Cook onion, carrot, celery, and crushed red pepper, garlic or garlic powder, one teapoon salt and 1/2 teaspoon pepper, oregano, cumin, in covered pot, stirring occasionally, for five minutes until softened. Add white wine or water and let cook down 3-4 minutes. Stir in tomatoes, broth, beans, chicken, and corn, if using; bring to a boil. Reduce to simmer and cook 10 minutes, stirring regularly. Taste and adjust seasonings. Serve hot with garnish, if desired.