There is no set rule on ingredients here, simply add 1/2 tsp baking powder and enough wholewheat flour to your mashed potato leftovers (it does not need to be cheesy) until a dough is formed. You want the dough just short of sticky. Add a touch of salt and pepper and shape into flat discs. Fry in butter and oil (I use avocado oil) and fry for about 10 minutes on each side or until nicely browned.
I served these with a slightly spiced yogurt, put a sprinkle of cumin and turmeric into some plain thick yogurt and stir.