1. Cut potatoes into 1-inch pieces; cook in boiling salted water until very tender, about 15 minutes. Drain well and remove to a large bowl. While potatoes are hot, mash with the remaining ingredients (except marshmallows).
2. To serve, spoon the potatoes into an oven-to-table dish and dot with marshmallows, if desired. Reheat in a 350°F oven until warmed through, about 15 to 20 minutes.
Serves 8. Per serving (without marshmallows): 190 calories, 37g carbs, 2g protein, 4.5g fat, 10mg cholesterol.
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