1
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry 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, 10-12 minutes.
Reserve 1 cup potato cooking liquid, then drain and return potatoes to pot. Keep covered off heat until ready to mash in Step 4.