Here's a delicious recipe from Munch's restaurant in St. Pete. It yields four patties!
24 oz of mashed potatoes (12 oz instant potato mix + 12 oz mashed red bliss potatoes)
1/4 tsp. white pepper
1/4 tsp garlic salt
1/4 onion, chopped
1/4 tsp Season All
Mix ingredients together, well.
Form into 4 patties
Cook on a buttered grill top until browned and crispy on both sides