Heat oil in nonstick skillet. Have other ingredients prepped before shredding potatoes as they will discolor. Shred potatoes and immediately combine with scallions and egg. Season mixture with salt and pepper. Scoop a heaping tablespoon of potato mixture into skillet and flatten with back of spoon. Continue cooking four pancakes at a time. When pancakes are brown flip to other side and continue to brown. Remove to paper towels to drain and season with salt.