Preheat the oven to 350°F. On a large baking sheet lined with foil or parchment paper, roast the sweet potatoes, about 1 hour and 15 minutes or until tender when pierced by a fork. Let cool to the touch, then remove and discard the skins.
In a large bowl, combine the sweet potatoes with the remaining ingredients and mash well, until thoroughly incorporated. Serve.
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