01 - Place potatoes in a saucepan, cover with cold water, add a pinch of salt. Bring to a boil and simmer 12–15 minutes until fork-tender. Drain well and return to pan to steam dry 1 minute.
02 - Mash potatoes until smooth. Stir in butter and milk until fully incorporated and creamy. Let cool 5 minutes.
03 - Add sliced scallions, flour, salt, and pepper to mashed potatoes. Mix thoroughly to form a soft dough.
04 - Turn dough onto lightly floured surface. Gently knead and pat into ¾-inch thick round. Cut into 8 wedges or use round cutter for circles.
05 - Heat large nonstick skillet or griddle over medium heat, melt a little butter. Fry potato cakes in batches 3–4 minutes per side until golden and crisp.
06 - Serve warm, garnished with extra scallions or dollop of sour cream if desired.