Remove the steaks from the refrigerator and let them sit at room temperature for 20–30 minutes.
Make the Boursin: in a small bowl, beat the softened cream cheese and butter together until smooth. Stir in the garlic, chives, parsley, dill, thyme, salt, and white pepper until evenly combined. Set aside.
Preheat the air fryer to 400°F (200°C) for at least 5 minutes.
Pat the steaks completely dry with paper towels. Rub both sides with olive oil, then season generously with salt, pepper, and steak seasoning if using.
Place the steaks in the air fryer basket in a single layer, leaving space between them. Cook for 5 minutes.
Flip the steaks and cook for another 4–6 minutes, until they reach 130°F internal temperature for medium rare (see Notes for other doneness levels).
Transfer the steaks to a cutting board, tent loosely with foil, and rest for 5 minutes.
Top each steak with a generous spoonful of homemade Boursin and serve immediately.