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Wash potatoes; place on a greased baking sheet.
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Bake at 450 degrees for 40 minutes or until tender; allow to cool.
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Slice skin away from top of each potato.
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Carefully scoop out pulp, leaving shells intact.
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Combine pulp, marshmallow cream, margarine, sugar, and salt in a bowl.
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Beat with electric mixer until light and fluffy.
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Spoon potato mixture into shells; top each with a quartered marshmallow.
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Bake at 350 degrees for 20 minutes or until well heated.