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In a large cast-iron skillet, heat 2 tablespoons oil until shimmering. Drop heaping tablespoons of the potatoes into the skillet and flatten them with the back of the spoon. Cook the pancakes over moderately high heat until the edges are golden, 1 1/2 to 2 minutes. Flip and cook until golden on the bottom, about 1 minute. Drain on paper towels. Repeat with the remaining potatoes, adding more oil to the skillet as needed.
Cook's Note: Reheat the pancakes in a single layer on a cookie sheet in a 400 degree oven until they're crisp again. If you undercooked them a bit or didn't get the browning on them you'd hoped for, you can compensate for this in the oven.