Season the meat with salt, pepper and curry and place in a baking dish.
Beat the egg whites until stiff. Mix both types of mustard with salt and breadcrumbs and fold into the egg white. Spread the chicken breast fillets with a knife. Put the butter in flakes on top.
Bake in the preheated oven at approx. 200 ° C top / bottom heat for about 20 - 25 minutes.