Pat the filet mignon dry with paper towels
Season generously with salt and black pepper
Let the steak sit at room temperature for 20 to 30 minutes
Heat a heavy skillet over medium-high heat until very hot
Add a small amount of high-smoke-point oil to the pan
Place the filet mignon in the skillet
Sear for 2 to 3 minutes without moving it
Flip the steak
Sear the other side for 2 to 3 minutes
Sear the edges briefly with tongs
Reduce heat to medium or medium-low
Add butter, garlic, and herbs if desired
Spoon the melted butter over the steak
Cook until the internal temperature reaches your preferred doneness
Remove the steak from the pan
Rest the steak for 5 to 10 minutes
Slice and serve