A fluffernutter is a type of sandwich made with peanut butter and marshmallow fluff spread between two slices of white bread. It is a popular treat in the United States, especially among children. The combination of creamy peanut butter and sweet marshmallow creates a unique flavor and texture. The origins of the fluffernutter date back to the early 20th century, with variations appearing in different regions. It is often enjoyed as a quick snack or dessert and can be customized with additional ingredients like sliced bananas or chocolate spread for added flavor.