1. Season chicken with salt and pepper. In large skillet brown chicken and mushrooms 4 minutes in hot oil, turning chicken halfway through.
2. Meanwhile, shred 2 teaspoons lemon peel; set aside. Slice lemon. Add broccoli and lemon slices to skillet. Cover; cook 8 minutes or until chicken is done (170 degrees F on an instant-read thermometer).
3. Place chicken and vegetables on plates. Add Alfredo sauce to skillet; heat through. Serve with chicken. Add lemon peel and pepper.