Crunchy oat topped fish pie - 9Kitchen

Ingredients

• 1 tablespoon olive oil
• 1 onion, chopped
• 1 carrot, diced
• 1 stick celery, chopped
• 2 tablespoons plain flour
• ½ cup fish stock
• 1 cup low fat milk
• 200g salmon fillet, skin removed and cut into 5cm pieces
• 300g white fish fillets, cut into 5cm pieces
• 1 tablespoon whole grain mustard
• ¼ cup chopped parsley
• salt and pepper
• 4 slices wholegrain bread, processed into breadcrumbs
• 1 cup rolled oats
• 1 cup grated low fat cheese