In a large mixing bowl, combine mashed potatoes, flour, and salt. Add melted butter. Stir until a soft dough forms, about 3–5 minutes.

Lightly flour your work surface and turn out the dough. Knead gently for 1–2 minutes until smooth and elastic.

Roll the dough into a circle about ¼ inch thick. Dust with flour if sticking.

Cut the rolled dough into quarters to form triangle-shaped farls.

Heat a non-stick skillet over medium heat. No oil needed because of the butter in the dough.

Cook each farl for 3–4 minutes on one side until golden brown, then flip.

Cook the other side for another 3–4 minutes until crispy. Serve warm with toppings.