Melt butter in a large non-stick skillet over medium heat. Add shallots and garlic. Cook 2 minutes.
Stir in mushrooms and cook 3-4 more minutes. Remove from skillet and set aside.
Increase heat to medium-high. Add steaks and cook 6-7 minutes for medium-rare (140°F), turning once. Remove steaks to a warm platter.
Decrease heat to medium. Add broth, brandy, mustard, Worcestershire sauce and reserved mushroom mixture. Bring to a boil. Stir until liquid is slightly reduced, about 1 minute.
Spoon sauce over steaks and sprinkle with parsley.
Serve with cooked fetuccini tossed with sauteed cherry tomatoes.