Pat the steak dry with a paper towel and allow to sit at room temperature for 30 minutes to take the chill off. While resting, brush both sides of the steak with olive oil and season with salt and pepper. You could also apply a rub or marinade at this time.
In a small bowl, whisk together the ingredients for the horseradish cream until combined.
Preheat the airfryer to 400°F, for at least 5 minutes.
Place the steak in the air fryer and cook for 8-12 minutes, flipping halfway. The steak is done when it reaches an internal temperature of 125°F for medium-rare or 136°F for medium.
Transfer the steak to a plate or cutting board and cover loosely with foil. Let it rest for 10 minutes. The temperature will continue to rise while resting to reach 130°F for medium-rare and 140°F for medium.
If slicing prior to serving, slice the steak against the grain. Serve with horseradish cream on the side.
Notes
Storage: Store leftover steak in an airtight container in the refrigerator for up to 3 days. The horseradish cream will keep for up to 1 week in a sealed jar in the fridge.