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Preheat oven to 400°. Wash and scrub sweet potatoes, then using a fork make several holes to allow steam to escape.
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Place on a foil lined baking sheet and bake for 50-60 minutes, or until easily pricked with a fork or knife. Allow to cool a few minutes, then slice each potato lengthwise.
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Scoop out the centers and place in a medium size mixing bowl. Add the butter, brown sugar, rosemary, cheese, salt and pepper and mix well. Carefully add the potato mixture back to the skins equally.