Season the filet mignon steaks generously with salt and black pepper on both sides.
Heat the olive oil in a heavy skillet over medium-high heat.
Sear the steaks for about 3-4 minutes on each side for medium-rare.
Remove the steaks from the pan and let them rest on a plate, tented with foil.
In the same skillet, add the chopped shallots and sauté over medium heat until translucent.
Deglaze the pan with the red wine, scraping up any brown bits.
Add the beef stock and simmer until the sauce reduces by half.
Finish the sauce by whisking in the unsalted butter until melted and creamy.
Serve the filet mignon topped with red wine reduction, garnished with herbs if desired.