Preheat oven to 375 degrees F (190 degrees C). Grease a 9×13-inch casserole dish.
Toss sweet potatoes with brown sugar in a bowl until coated; arrange in the prepared casserole dish. Top sweet potatoes with marshmallows.
Bake in the preheated oven until sweet potatoes are tender and marshmallows are browned, 35 minutes.
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