In a large mixing bowl, combine mashed potatoes, all-purpose flour, salt, and melted butter. Stir well until a soft dough begins to form.

Lightly sprinkle flour on your clean work surface and transfer the dough onto it. Knead gently for about 1-2 minutes until smooth.

Roll the dough into a circular shape roughly 1/4 inch thick using a rolling pin.

Use a knife or dough cutter to divide the circle into four equal quarters.

Place a non-stick skillet over medium heat for a couple of minutes.

Carefully place the cut farls in the heated skillet, cooking each for 3-4 minutes until golden brown.

Gently flip each farl and let it cook for another 3-4 minutes on the other side until crispy.

Once cooked, remove the farls from the skillet and serve warm with toppings.