Remove the ribeye steaks from the refrigerator and let them sit at room temperature for about 30 minutes. Pat the steaks dry with paper towels, then season both sides generously with salt and freshly ground black pepper.
Heat a large skillet over medium-high heat and add 2 tablespoons of olive oil. Once the oil is hot and shimmering, carefully place the seasoned steaks in the skillet. Sear the steaks for about 4-5 minutes on each side for medium-rare. Once cooked, transfer the steaks to a plate and loosely cover with foil to keep warm while they rest.
In the same skillet, reduce the heat to medium. Add the sliced mushrooms to the pan and sauté, stirring occasionally, until they start to turn golden brown and release their juices, about 4-5 minutes.
Add the minced garlic and thyme to the mushrooms in the skillet. Stir and cook for an additional 1-2 minutes, just until the garlic becomes fragrant but be cautious to prevent burning.
Lower the heat to a gentle simmer and incorporate the remaining 4 tablespoons of butter into the skillet. Allow the butter to melt completely and blend with the mushrooms and garlic, creating a luscious sauce. Taste and adjust seasoning with additional salt and pepper as needed.
Place the cooked steaks back into the skillet, spooning the garlic butter mushroom mixture generously over each steak. Let them cook together for about a minute to allow the flavors to meld.
Carefully transfer each steak to a serving plate and generously top with the savory garlic butter mushrooms. Finish by sprinkling freshly chopped parsley over the steaks for a pop of color and added freshness.
Notes
Let the steaks rest after cooking for better flavor.