How to Make It
Step 1
Heat oven to 300° F.
Step 2
Place the potatoes in a large pot with enough cold water to cover them by 2 inches. Bring to a boil and cook until tender, about 15 minutes. Drain well, return to pot, and mash. Add 8 tablespoons of the butter, the cream, milk, salt, and pepper.
Step 3
Transfer to a casserole and dot with the remaining butter, cut into small pieces. Place in oven, uncovered, to keep warm for up to 1 hour.