Lisa Weinstein, from Schererville, Indiana, says that her three-year-old son, Nicholas, doesn't miss an opportunity to make these "marshed" potatoes, although she's not sure what he likes more: dumping in the ingredients or stealing from the stash of marshmallows.
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Heat the oven to 350 degrees. Combine the sweet potatoes, egg, sugar, cinnamon, and vanilla extract in a bowl and mix with an electric mixer on medium speed for 2 to 3 minutes. Empty the mixture into a 2-quart ungreased baking dish. Bake uncovered for 25 minutes. Top with the marshmallows and bake for an additional 5 minutes. Serves 4 to 6.