Marsala, a fortified wine often served as a dessert wine, gives the sweet potatoes a rich flavor--but you may omit it, if desired.
Preheat oven to 425°.
Bake potatoes at 425° for 1 hour and 10 minutes or until tender; cool slightly. Cut each potato in half lengthwise, and scoop out pulp. Discard skins.
Place potatoes and remaining ingredients in a small saucepan; mash to desired consistency. Cook over low heat 2 minutes or until thoroughly heated. Garnish with thyme, if desired.
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