Drain the cooked boiled potatoes - leaving some potato water too add as well and place onto half of the cheesy Bechemel Sauce (remove half of the sauce from the Skillet).Place in the oven and bake for 40 minutes.

During the last 10 minutes of cooking time,add about 450g of frozen fish fillets to a baking tray and add a little bit of cold water too the baking tray and turn fish fillets half way through cooking time - 10 minutes should be long enough for the fish fillets to be cooked. Add half of the cheesy mash to a large Dinner Plate and then serve all of the fish fillets with it - for One big portion of dinner.