Prep Time: 10 minutes
Cook Time: 6 minutes
Combine oil, parsley, cilantro, vinegar, garlic and salt; mix well. Marinate steaks in mixture in a pie plate or shallow plate at room temperature for 20 minutes or in refrigerator up to 8 hours.
Remove steaks from marinade; reserve marinade in plate. Place steaks on a preheated medium-hot grill; brush with reserved marinade. Grill covered 5 to 6 minutes per side for medium-rare. Transfer steaks to a serving plate; top with cheese. Cover loosely with foil and let stand 5 minutes or until cheese is melted.