This recipe was demonstrated by a fellow classmate at an evening course on fish cookery that I took over 30 years ago. It sounded odd - who puts cheddar cheese with scallops!? but tasted delicious. Only use instant potatoes if you can get high quality ones that don't have artificial ingredients or flavors. This make a nice main course served with a salad though would be great served in smaller individual portions as an appetizer. If you make this with bay scallops you may want to reduce the cooking time so you don't end up with rubbery scallops. I like to use a medium sized scallops, if using large ones you may want to cut them in half. Please note that you need to reserve some of the cooking liquid when draining the scallops. Cooking time does not include preparing mashed potatoes.