Bring a large pot of salted water to a boil. Cook pasta according to package directions, about 11 minutes. Drain, reserving 1/2 cup pasta water. Return pasta to pot.
While pasta is cooking, heat a large nonstick skillet over medium heat. Add onion and oregano; coat generously with nonstick cooking spray. Cover and cook, stirring occasionally, for 3 minutes.
Stir broth and vinegar into skillet. Stir in chicken, beans and olives; cook for 2 minutes or until heated through. Toss with pasta and serve, adding reserved pasta water if too dry.