Place pasta, tomatoes, onion, garlic, basil, in a large stock pot. Pour in vegetable broth. Sprinkle red pepper flakes and oregano on top. Drizzle top with oil. Cover pot and bring to a boil. Reduce to a low simmer and keep pot covered and cook for about 10 minutes, stirring every 2 minutes or so. Cook until almost all liquid has evaporated.(Leave about 1 inch of liquid in the bottom of the pot).