Heat oil in large pan to 350 F, Place steak, onion and mushrooms in and let sizzle for 30 seconds.
Flip steak, let cook 20 seconds, separate slices and mix in onion/mushrooms.
Finish cooking steak, add wine and let reduce down halfway while mixing in steak and mushrooms.
Arrange steak mixture to be the same size of the roll and top with brie cheese.
Place hinged roll over meat and cheese and allow to melt.
Slide spatula under inverted steak and flip right-side up. Top with apple chutney.