First boil the potatoes for 20-25 mins so they are super soft. Mash them with the butter and allow to cool
Add in the flour, baking powder and salt and mix to a dough
Add to a floured surface, roll into a pancake sized thickness and cut into squares
Fry on a dry pan for 4-5 mins on each side. If serving as part of a fry up fry in oil for an additional 1-2 mins on each side