1. Flatten chicken to 1/2-in. thickness.
2. In a skillet, brown chicken on both sides in butter and oil; remove and set aside.
3. In the same skillet, saute onion until tender.
4. Add basil, garlic, salt and pepper; cook and stir for 2-3 minutes.
5. Stir in broth, cream, parsley and tomatoes. Return chicken to pan.
6. Cover and simmer for 15 minutes or until chicken juices run clear.
7. Meanwhile, cook fettuccine according to package directions; drain.
8. Arrange chicken over fettuccine; top with sauce.
9. Yield: 6 servings.