01 - Grate potatoes and onion using large holes of a box grater or a food processor.
02 - Place grated mixture in a clean dish towel and squeeze out as much liquid as possible; discard liquid.
03 - In a large bowl, mix grated potatoes and onion with eggs, flour, salt, and pepper until fully incorporated.
04 - Heat vegetable oil in a large skillet over medium-high heat until shimmering.
05 - Scoop 2 tablespoons of potato mixture per latke and flatten gently in skillet; avoid overcrowding.
06 - Fry each latke for 3 to 5 minutes per side until golden brown and crisp; transfer to paper towel-lined plate to drain.
07 - Continue cooking remaining batter, adding oil as needed.
08 - Serve latkes hot with sour cream and optional chopped chives or scallions.