Though you can change up the recipe if you like ― baking powder makes a lighter, fluffier dough, and butter creates a mouth-wateringly delicious dough ― the basic farl dough only needs mashed potato ...
Personally, I like about 25g of plain flour per 100g potato; I add a half teaspoon of baking powder per 100g of flour. Potato farls are meant to be made with freshly boiled potatoes, which have ...