What is this food called? Or how would you make it?

[squareapple052]

Hi, I am a member of a little site/app called ifunny and I saw this super delicious looking thing, but I don't know what I would call it?
They basically melted chocolate chips, mixed it with marshmallows and milk, then poured it into a pie dish. Then they poured marshmallows on top of that and baked it, and dipped graham crackers into it. I bought all the things I needed for it, but I am the type of person that is very uncomfortable cooking without a recipe.
What would you call this so that you could get a proper answer on google? When I ask vaguely in terms of "marshmallows on top of melted chocolate" I don't get the best answers. Otherwise, how long would you bake this, and at what temperature?

Thanks in advance.