01 - Place diced potatoes in a saucepan with cold, salted water. Bring to a boil, then simmer for 10–12 minutes until fork-tender. Drain well and return to the pan to steam dry for 1 minute.
02 - Mash potatoes until smooth. Add butter and milk; mix until creamy and lump-free. Let cool for 5 minutes.
03 - Stir in sliced scallions, salt, and pepper. Gently fold in flour until a soft, workable dough forms.
04 - Turn dough onto a lightly floured surface. Pat or roll out to ½ inch thickness. Cut into rounds using a 3-inch cutter, or shape into rustic squares or triangles.
05 - Heat a large nonstick skillet over medium heat and melt a little butter. Cook cakes in batches for 3–4 minutes per side, until golden brown and crisp.
06 - Serve hot, with extra butter or as part of a traditional Irish breakfast.