Preheat oven to 375degrees F (190 degrees C).Grease a 9×13 inch baking dish.
Bring a pot of water to a boil.Add sweet potatoes and cook until tender, about 15 minutes. Drain and mash with butter, sugar, milk, salt and lemon zest.Shape mixture into balls, with a marshmallow in the center of each.Roll in cereal crumbs and place in prepared dish.
Bake in preheated oven for 20 minutes, or until marshmallows begin to ooze.
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