1
Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Peel and dice sweet potatoes into ½-inch pieces; transfer to 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 sweet potato cooking liquid, then drain and return sweet potatoes to pot. Keep covered off heat until ready to mash.