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Adjust rack to top and middle positions and preheat oven to 450 degrees. Wash and dry produce.
Dice potatoes into 1⁄2-inch pieces. Place in a large pot with enough salted water to cover by 2 inches. Bring to a boil and cook until tender, 15-20 minutes.
Reserve 1⁄2 cup potato cooking liquid, then drain and return potatoes to pot.
Keep covered off heat until ready to mash.