One of my favourite sweet treats are marshmallows. I love the big poofy ones just as they are, I like them toasted up so they're starting to go a little black on the edges but really gooey inside, I like smores, and I like the marshmallowey bits in some cereal...
But by far I think my favourite marshmallow thing.... marshmallows on hot chocolate. Urgh. Something about it is just utter perfection.