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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Grate potatoes on the largest holes of a box grater. Halve and peel onion; grate on the largest holes of a box grater until you have 1⁄4 cup (1⁄2 cup for 4 servings). (Save remaining onion for another use.) Finely chop chives. Halve, core, and thinly slice apple.