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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry all produce. Dice potatoes into ½-inch pieces. (TIP: For a smoother texture, peel potatoes first.) Finely chop chives. Halve, peel, and thinly slice onion; mince a few slices until you have 2 TBSP (4 TBSP for 4). Trim green beans, if necessary.