Prep the Steak
Pat the steak dry with paper towels. Season generously with salt and pepper on both sides. Let it sit at room temperature for 20–30 minutes before cooking.
Sear in Cast Iron
Heat a cast iron skillet over medium-high heat. Add olive oil. Once hot and shimmering, sear the steak for 3–4 minutes per side, depending on thickness and desired doneness. Add butter during the last minute and spoon over the steak.
Rest the Steak
Transfer the steak to a plate or cutting board and loosely tent with foil. Let it rest for at least 5 minutes while you prepare the sauce.
Make the Sauce
In the same skillet (don’t wipe it), reduce the heat to medium. Add 1 tablespoon butter and the minced garlic. Sauté for about 30 seconds until fragrant.
Deglaze with Whiskey
Carefully pour in the whiskey, scraping the bottom of the pan to deglaze. Let it reduce for about 1–2 minutes.
Add Cream and Simmer
Stir in the beef broth, heavy cream, and Dijon mustard. Simmer for 3–4 minutes until the sauce thickens slightly. Season with salt and pepper to taste.
Slice and Serve
Slice the rested steak against the grain. Spoon the warm whiskey garlic cream sauce over the top and garnish with fresh thyme or parsley if desired.