Cook pasta as directed on package. Meanwhile, heat oil in large skillet on medium heat. Add vegetables and garlic; cook and stir 3 minutes or until veggies are crisp tender. Stir in chicken, sauce and oregano; bring to a boil, stirring frequently. Remove from heat. Drain pasta. Add to sauce with singles, stir. Top with mozzarella and parmesan; cover. Remove from heat. Let stand 5 minutes or until mozzarella is melted.