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Set oven temperature to 350�F.
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In a large pot, cook the sweet potatoes in water with salt for 20 minutes over medium-high heat.
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Drain the sweet potatoes and then add the orange juice, brown sugar, nutmeg, cinnamon, and butter to the pot. Whip the mixture until it is smooth.
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Place the mixture into the casserole dish and spread it evenly. Add the marshmallows on top of the sweet potatoes.
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Bake the casserole for 10 minutes or until the marshmallows are light brown.
