Basically any recipe that calls for a chicken breast can be adapted to using quorn fillets.
And you don't have to leave it in one piece, why not slice it into strips?
There are some lovely recipes on the quorn website
MOROCCAN QUORN TAGINE
MINI TANDOORI PITTAS
QUORN CHILLI WRAPS
QUORN ORIENTAL BROTH
QUORN VEGETABLE THAI CURRY
QUORN AND MUSHROOM STOGANOFF