Preheat the oven to 350 degrees F (175 degrees C).
Place sweet potatoes in a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 15 minutes. Drain.
Place 1/2 of the sweet potatoes in a medium mixing bowl. Mash, then mix in condensed milk, butter, and cinnamon. Add remaining sweet potato cubes and sprinkle in all but 1 tablespoon brown sugar; stir gently to combine but not so much that the sugar dissolves. Transfer potato mixture to a 2-quart baking dish, top with marshmallows, and sprinkle remaining brown sugar on top.
Bake in the preheated oven until marshmallows are golden brown, 10 to 15 minutes.
Nutritional Facts
Per 10 servings
Calories: 398
Carbohydrate: 71g
Fat: 11g
Fiber: 8g
Protein: 5g
Sugar: 32g
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