01 -
Heat the oven to 425°F. Add 1/4 cup oil to a 10-inch cast-iron skillet and place it in the oven for 8-10 minutes while you prepare the potatoes.
02 -
Grate the potatoes and onion with a box grater or food processor shredding disk. Transfer to a colander and squeeze firmly to remove as much liquid as possible.
03 -
In a large bowl, whisk the eggs, potato starch, salt, pepper, and remaining 1/4 cup oil. Add the drained potatoes and onion, then mix until evenly coated.
04 -
Carefully remove the hot skillet from the oven. Spoon in the potato mixture and spread it evenly without pressing it down hard.
05 -
Bake for 50-60 minutes, until the top is deep golden brown, the edges are crisp, and the center is tender when pierced with a knife.
06 -
Let the kugel rest for 10 minutes before slicing. Sprinkle with chives and flaky salt, then serve warm with applesauce or sour cream if you like.