01 - Grate potatoes and onion using the large holes of a box grater or a food processor.
02 - Place grated mixture in a clean kitchen towel and squeeze out as much liquid as possible, then discard the liquid.
03 - In a large bowl, mix grated potatoes and onion with eggs, flour, kosher salt, and black pepper until fully incorporated.
04 - Heat vegetable oil in a large skillet over medium-high heat until shimmering.
05 - Scoop about 2 tablespoons of the potato mixture per latke and flatten gently with a spatula in the skillet, avoiding overcrowding.
06 - Cook each latke for 3 to 5 minutes per side until golden brown and crisp; transfer to paper towels to drain excess oil.
07 - Continue frying remaining latkes in batches, adding more oil to the skillet as necessary.
08 - Serve latkes hot topped with sour cream and optionally a sprinkle of chopped chives or scallions.