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Preheat oven to 350 degrees.
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Place sweet potatoes in a large saucepan with enough water to cover. Bring to a boil and cook until tender, about 15 minutes. Remove from heat, drain and mash.
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Place mashed sweet potatoes in large bowl and use an electric mixer to blend with the margarine, brown sugar, orange juice and cinnamon. Spread evenly into a 9x13 inch baking dish.
- Bake covered for 25 minutes, remove cover and add marshmallows and cook for an additional 5 minutes uncovered to toast the marshmallows.
Recipe Adapted from AllRecipes