Fluffernutter (uga diarani "butter peanut and marshmallow sandwich", "peanut butter and marshmallow fluff sandwich", utawa "peanut butter and marshmallow sandwich") yaiku sandwich sing digawe karo butter kacang lan crem marshmallow biasane disajikake ing roti putih . Variasi sandwich kalebu substitusi roti gandum lan tambahan macem-macem bahan sing legi, asin, lan gurih . Istilah "fluffernutter" uga bisa digunakake kanggo nggambarake panganan liyane, utamane panganan cuci mulut, sing kalebu butter kacang lan crem marshmallow.