Heat oil in a pan and brown fillets lightly on both sides. Put fillets into a hot oven pan. In a pan fry onions and capsicum until onion is transparent then place them on top of the fillets. Add some butter to the oil in the pan and add the flour. Mix until a paste is formed. Pour in milk with water little at a time, stirring constantly until sauce is smooth. Add salt, pepper and bay leaf, then pour sauce over the fillets. Sprinkle with breadcrumbs and pour some butter on top of the crumbs. Put into hot oven at 210C. until golden brown on top. Sprinkle with chives and serve.