01 - Grate the starchy potatoes on a box grater. Place in a clean towel and squeeze out as much moisture as possible.
02 - Boil the waxy potatoes in salted water until tender, about 10–12 minutes. Drain and mash until smooth.
03 - In a large bowl, combine the grated raw potatoes, mashed potatoes, milk, melted butter, and egg. Mix until well combined.
04 - Add the flour, baking powder, salt, and pepper. Stir to form a thick batter.
05 - Fold in the sliced scallions until evenly distributed throughout the batter.
06 - Heat a large skillet over medium heat and add a tablespoon of butter or oil.
07 - Drop ¼-cup portions of batter into the pan, flattening each to about ½ inch thick.
08 - Cook for 3–4 minutes per side, until golden brown and crispy. Repeat with remaining batter, adding more butter or oil as needed.
09 - Serve hot, garnished with extra scallions if desired.