Preheat the oven to 425 degrees.

Remove the steak from the packaging and allow it to rest at room temperature while the oven preheats. Brush both sides of the steak with vegetable oil and sprinkle generously with salt and pepper.

Place a cast iron skillet over medium high heat and coat with about a Tablespoon of vegetable oil. Heat the pan until the oil is shimmering and droplets of water sizzle in the pan. Add the steaks to the pan and allow them to cook until seared on one side, about 3-4 minutes. Flip the steaks over and then place in the oven to continue cooking until the internal temperature reaches 145 degrees for medium, or about another 4-6 minutes. Remove the steaks from the oven, transfer to a plate (preferably a warm plate!) and place a Tablespoon of butter on each steak. Tent with foil and allow to rest for at least 10 minutes.

Meanwhile, make the mushrooms. Melt 2 Tablespoons of the butter in a large skillet over medium heat. Add the mushrooms and allow them to cook undisturbed until well browned on one side. Flip them over and continue to saute until the mushrooms are soft and browned. Stir in the garlic and cook for another minute, or until fragrant. Serve the steaks with the mushrooms on top.