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Adjust racks to middle and top positions and preheat oven to 425 degrees. Wash and dry produce.
Dice potatoes into ½-inch pieces.
Place potatoes 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 1 cup potato cooking liquid (2 cups for 4 servings).
Drain and return potatoes to pot. Keep covered off heat until ready to mash.