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Adjust rack to middle position and preheat oven to 425 degrees. Wash and dry all produce.
Dice potatoes into ½-inch pieces. Place in a medium pot with enough salted water to cover by 2 inches. Bring to a boil and cook until tender, 15-20 minutes.
Reserve ½ cup potato cooking liquid, then drain and return potatoes to pot. Keep covered off heat until ready to mash.