Season Tenderloins with salt and pepper to taste.  Heat 2 Tablespoons of oil in a large skillet or Grill Pan over medium-high heat until hot but not smoking.  Cook the tenderloins to desired doneness, about 4 minutes per side for medium-rare.  Transfer steaks to plates.  

 

Add 2 Tablespoons oil the the pan over medium heat until hot; add shallots, and sauté 4 minutes or until tender.

 

Heat the Rosie's Marsala Sauce and Bring to a low simmer.  Spoon the Marsala sauce and mushrooms over the beef tenderloins.