In a mixing bowl, combine minced garlic, chopped rosemary, chopped thyme, salt, black pepper, and olive oil. Mix well to form a marinade.

Add the beef medallions to the marinade, ensuring they are well coated. Cover and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.

Heat a skillet over medium-high heat. Once hot, add the marinated steak medallions to the skillet.

Cook for about 4-5 minutes on each side for medium-rare, or until desired doneness is reached.

Remove from heat and let the steak rest for 5 minutes before serving.