Pat steaks dry and season both sides with salt and pepper.

Heat olive oil in a cast iron skillet over medium-high heat. Sear steaks for 3–4 mins per side until nicely browned.

In a bowl, mix mayo, Parmesan, garlic, mustard, and Italian seasoning.

Spread mixture evenly over the top of each steak.

Transfer skillet to the oven and broil on high for 2–3 mins, or until the crust is golden and bubbly.

Rest steaks for 5 minutes, then sprinkle with chopped parsley and serve.