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Preheat oven to 375.
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Roast the sweet potatoes on a large baking sheet until tender, about 1 hr 10 minute.
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Meanwhile, in a skillet, melt the butter. Add the pecans, sugar and chipotle powder and cook over moderate heat, stirring, until the sugar starts to caramelize and the pecans are well coated (approx. 8 min).
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Spread pecans on a parchment-lined baking sheet, sprinkle with salt, and let cool.
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Cut potatoes in half lengthwise and scoop the flesh into a food processor; discard skins. Add the honey, cinnamon, allspice, and cloves to the processor and puree. Add the cream and puree. Season with salt and pepper.
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Scrape the potatoes into a 9x13 baking dish; scatter marsh mellows on top.
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Bake in the top third of the oven for 25 minutes, until the marsh mellows are golden. Sprinkle with pecans and serve.