1. Rinse chicken and pat dry. In large skillet, in hot oil, brown chicken on all sides. Remove chicken.
2. Drain oil from skillet and reserve 1 tablespoon. In reserved tablespoon of oil, cook mushrooms and onion until tender.
3. Stir in marinara sauce, artichokes, and olives. Return chicken to skillet. Cover and cook about 25 minutes, stirring occasionally, until chicken is no longer pink when cut into.
4. Serve over fettuccine and sprinkle with cheese.