01 -
Place the peeled and cubed sweet potatoes in a large pot, cover with cold water, and bring to a boil over high heat. Cook until fork-tender, about 15 minutes.
02 -
Drain the cooked sweet potatoes thoroughly and transfer to a large mixing bowl. Mash until smooth and lump-free.
03 -
Add brown sugar, unsalted butter, milk, and vanilla extract to the mashed potatoes. Stir until the mixture is fully combined and creamy.
04 -
Lightly grease a baking dish and spread the sweet potato mixture evenly. Sprinkle mini marshmallows over the surface as desired.
05 -
Bake in a preheated oven at 350°F (175°C) for 25 to 30 minutes, or until the center is heated through and marshmallows are golden brown.