In a large mixing bowl, combine your cooled mashed potatoes, all-purpose flour, salt, and melted butter. Use a fork or your hands to mix until a soft dough forms.

Lightly flour your work surface to prevent sticking, then gently turn out the dough. Knead for about 1-2 minutes until smooth.

Roll the dough into a circle approximately 1/4 inch thick. Cut into quarters to create wedges.

Preheat a non-stick skillet over medium heat. Cook each farl for about 3-4 minutes per side until golden brown.

Remove from skillet and let cool slightly. Serve warm with butter or alongside favorite breakfast items.