Rub the entire tenderloin with olive oil. Season the tenderloin with salt. Roll the tenderloin in the cracked black pepper. In a hot saute pan, sear the tenderloin for 3 minutes on all sides for medium rare. Remove the tenderloin from the pan and allow to rest for 5 minutes before slicing.

Prehet the oven to the broil setting.

Spread each slice of toasted bread with Creole Mustard. Slice the tenderloin into thin slices. Divide the beef into eighths. Start building the sandwich with the beef, cheese, onions, and peppers. Place the sandwiches on a baking sheet and transfer to the oven. Broil until the cheese is slightly melted, about 1 to 2 minutes. Garnish with sprigs of fresh basil.

Serve hot with a fork and knife.