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spray 8x8 baking dish with nonstick cooking spray.
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in a 3 qt saucepan,place sweet potatoes and water to cover; heat to boiling.
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reduce heat, cover and simmer 25-30 mins or until tender.
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drain potatoes and cool slightly.
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peel and cut into large chunks, place in prepared 8x8 dish.
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preheat oven to 350.
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in a small saucepan melt butter, stir in syrup and sugar over low heat stirring 3-5 mins until blended.
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sprinkle nuts over sweet potatoes then top with syrup mixture.
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bake 25 minutes.
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top with marshmallows.
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bake 5-7 minutes.