Season your steak generously with salt and pepper on both sides and let it sit for 5 minutes.
While the steak rests, add your fries to an air fryer and cook according to the package instructions.
Add oil to your pan and cook your steak for 7 minutes, flipping every 30 seconds.
Add butter at the end and baste for about 30 seconds before removing and letting it rest for 10 minutes.
For the chimichurri sauce, combine parsley, salt, oregano, chili flakes, black pepper, paprika, minced garlic, sesame oil, neutral oil, and rice vinegar in a bowl and mix thoroughly.
Thinly slice your rested steak, then plate by laying down your fries and topping with the sliced steak and chimichurri. Optionally place extra sauce on your fries.
