Preheat oven to 400°F. Bake sweet potatoes at 400°F for about 1 hour or until tender. Let cool to touch; peel and mash sweet potatoes. Reduce oven temperature to 350°F.
Beat mashed sweet potatoes, sugar, and next 5 ingredients at medium speed with an electric mixer until smooth. Spoon potato mixture into a greased 11- x 7-inch baking dish.
Combine cornflakes cereal, pecans, brown sugar, and melted butter in a small bowl. Sprinkle over casserole.
Bake at 350°F for 30 minutes. Remove from oven; let stand 10 minutes. Sprinkle with marshmallows, and bake 10 more minutes. Let stand 10 minutes before serving.
Notes
Shop for sweet potatoes that are all about the same size to ensure that the baking time for each potato will be the same. This prevents having to leave larger potatoes in the oven longer than planned.Recipe from The Southern Vegetable Book (Oxmoor House, 2016) by Rebecca Lang