1
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Dice potatoes into 1⁄2-inch pieces. Place in a medium pot with enough salted water to cover by 2 inches. Bring to a boil and cook until tender, 10-15 minutes. Reserve 1⁄2 cup potato cooking liquid, then drain.
Return potatoes to pot and keep covered off heat until ready to mash in Step 6.