01 - Boil the potato chunks in salted water for 10–12 minutes until fork-tender. Drain well and mash until smooth. Let cool slightly.
02 - Place the grated raw potatoes in a clean tea towel and squeeze out as much moisture as possible.
03 - In a large bowl, combine mashed potatoes, grated potatoes, scallions, milk, melted butter, flour, baking powder, salt, and pepper. Mix until a thick batter forms.
04 - Heat a large nonstick skillet or griddle over medium heat and add a little butter.
05 - Scoop 2–3 tablespoons of batter per pancake into the pan, flattening gently with a spatula.
06 - Cook for 3–4 minutes per side, or until golden brown and crisp. Work in batches, adding more butter as needed.
07 - Transfer cooked boxty to a plate and keep warm while you finish the batch. Serve hot, topped with sour cream, extra scallions, or chives if desired.