01 - Place grated potatoes in a clean kitchen towel and squeeze out as much liquid as possible to ensure crispy results.
02 - Combine potatoes, scallions, onion, eggs, flour, salt, pepper, and garlic powder in a large bowl. Mix until all ingredients are evenly distributed.
03 - Heat half the vegetable oil in a large nonstick skillet over medium heat.
04 - Scoop approximately ¼ cup of potato mixture per cake into the skillet. Gently flatten with a spatula to create rounds about ½ inch thick.
05 - Fry for 3–4 minutes per side until golden brown and crisp. Add more oil as needed between batches. Transfer cooked cakes to paper towel-lined plate.
06 - Serve warm topped with sour cream and garnish with chives or additional scallions if desired.