01 - Remove steaks from refrigerator 30 minutes before cooking to reach room temperature. Pat completely dry with paper towels.
02 - Generously season both sides of each steak with salt and freshly ground black pepper, pressing the seasoning into the meat.
03 - Heat olive oil in a large cast iron skillet over high heat until shimmering. Add steaks and sear for 3 to 4 minutes per side for medium-rare doneness.
04 - Transfer steaks to a plate, cover loosely with aluminum foil, and let rest while preparing the sauce.
05 - Reduce heat to medium. Add butter to the same skillet. Once melted, add minced garlic and sauté for 1 minute until fragrant.
06 - Pour in beef broth and scrape up any browned bits from the bottom of the pan with a wooden spoon.
07 - Stir in heavy cream and bring to a gentle simmer. Let cook for 2 minutes until slightly thickened.
08 - Add Dijon mustard and Parmesan cheese, stirring constantly until smooth and thickened, about 2 to 3 minutes.
09 - Stir in chopped parsley and season with salt and pepper to taste.
10 - Slice the rested steaks against the grain. Serve immediately topped with creamy garlic sauce and garnished with additional fresh parsley if desired.