I have been making this for years, as it is quick and is a complete meal in one dish. I am posting my basic recipe but, if you'd rather have tomato sauce than gravy, try that instead. If you'd like, you can sprinkle about 1/2 cup of your favorite cheese over the potatoes before sprinkling with paprika. And you can also use two 16-oz. bags of frozen mixed vegetables instead of the corn, carrots, and peas, or any leftover vegetables you may have. This is really an incredibly versatile recipe! I would also suggest you check the seasoning before adding the cooked mixture to the baking dish. Both the onion soup mix and gravy have sodium, so taste it before adding salt. If you don't have leftover mashed potatoes, instant potatoes will work fine.