Fluffernutter is a sandwich that is made with peanut butter and marshmallow fluff. Peanut butter is a yummy spread that comes from peanuts and it's very sticky. Marshmallow fluff is a sweet and sticky spread that tastes like marshmallows, which are small, soft and sweet candies.
So, when you mix peanut butter and marshmallow fluff, you get a sandwich that tastes sweet and peanut-y! It's a very popular sandwich, especially in America, and people love eating it as a snack or for lunch.
But remember, it's important to ask an adult to help you make a fluffernutter sandwich as peanut butter can be tricky to spread and marshmallow fluff is very sticky!