The article discusses the history of sweet potato casserole and the addition of marshmallows as a topping. It explains that marshmallows were included in the dish as part of a marketing strategy in 1917. However, the article suggests swapping the marshmallows for cornflakes to add a savory element and crunchiness to the casserole. It provides instructions on how to make a sweet potato casserole with a cornflake topping, including mixing the cornflakes with melted butter, salt, cinnamon, nutmeg, brown sugar, and chopped nuts. Finally, it advises adding the topping to the casserole just before baking to maintain its crunchiness.