Heat skillet on high heat. Add steak; cook 4 to 5 min. on each side or until medium doneness (160°F). Remove steak from skillet, reserving drippings in skillet; cover steak to keep warm.
Add brandy to meat drippings in skillet; cook to deglaze skillet, stirring constantly to remove browned bits from bottom of skillet. beef broth; bring to boil. Reduce heat to medium-low; cook 3 to 5 min. or until broth mixture is slightly reduced, stirring constantly. cheese, cream and mustard; mix well. Cook until cheese is completely melted and mixture is well blended, stirring frequently.
Cut steak into four pieces; place one piece on each of four serving plates. Top evenly with the cheese sauce; sprinkle with parsley.