Filet Mignon with Peppercorn Mustard Sauce

Sprinkle the steaks with salt and pepper. Heat the oil in a 9-inch diameter cast-iron skillet over medium-high heat until hot. Add the steaks; cook for 5 minutes on each side or until desired browning. Remove the steaks from the pan; keep warm. Add the shallots to the skillet; saute for 30 seconds. Add the brandy; cook for 10 seconds. Add broth and mustard; mix well. Reduce heat; cook for 2 minutes, stirring constantly. Serve the steaks with the sauce.