Pat the filet mignon dry with paper towels
Lightly coat all sides with oil
Season generously with kosher salt
Add freshly ground black pepper
Optional: add garlic powder
Optional: add onion powder
Optional: add a small amount of smoked paprika
Optional: add chopped fresh rosemary or thyme
Let the steak sit at room temperature for 20 to 30 minutes
Season again lightly just before cooking if needed