Allow steaks to rest at room temperature for 30 minutes prior to cooking. Insert a meat thermometer into one of the steaks. Season meat with salt and pepper.
Preheat oven to 400 degress F.
Heat a large oven safe skillet over high heat. Add olive oil. When the oil is hot, add the steaks and allow to brown, undisturbed, for about 5 minutes. Turn the steaks and immediately transfer to preheated oven. Cook until you reach an internal temperature of 125-130 degrees F. Remove from oven, transfer steaks to a plate, and loosely cover with aluminum foil.
Using the same pan, cook mushrooms and green onions over high heat, stirring only occasionally, until browned. Reduce heat to medium, add garlic, stir, and cook for another 1-2 minutes.
Add malbec wine and fresh herbs. Use a wooden spoon to scrape the bottom of the pan and allow wine to reduce by about half. Remove from heat and stir in butter to finish off sauce.
To serve, top steak with a large spoonful of the mushrooms with extra sauce.