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Preheat oven to 375
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Place sweet potatoes or carrots in a large saucepan or pot and cover with 1 inch water.
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Bring to a boil, turn down to low and simmer for 15-20 minutes
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Drain, return to pan. Heat over medium heat, stirring until water has evaporated, about 2 minutes.
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Remove pan from heat. Add milk, butter, and cinnamon and mash until smooth. Use a food processor if necessary
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Season with salt and pepper to taste
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Transfer mixture to a baking dish. Top with marshmallows and bake for 15-20 minutes until marshmallows are lightly browned.