Cook pasta to desired doneness as directed on package.
Meanwhile, heat oil in large nonstick skillet over medium heat until hot. Add onions and garlic; cook and stir about 6 minutes or until onions are tender. Add tomatoes, beans and oregano; mix well. Bring to a boil. Reduce heat; simmer 5 to 10 minutes to blend flavors.
Drain pasta. Serve sauce over pasta. If desired, sprinkle with grated or shredded Parmesan cheese.