Marshmallow fluff is a sweet, spreadable confection made primarily from sugar, corn syrup, and egg whites. It has a light, airy texture and a sweet vanilla flavor, making it a popular ingredient in desserts and snacks. Often used as a topping or filling, it can be found in recipes for s'mores, rice crispy treats, and various cakes. This fluffy treat is typically sold in jars and can be enjoyed on its own or paired with other foods. It is also a key component in the classic fluffernutter sandwich, which combines marshmallow fluff with peanut butter on bread.