Seems like FatCat's a regular fixture on this list, but it's deservedly so.
This budget plated dessert features crumble-studded banana caramel ice-cream, sitting on a chocolate sandwich cookie base, and wrapped up in a golden-brown torched marshmallow. It's wonderfully nutty, sweet and gooey, comes with a side chick of a caramel tuile, and best of all, paid for with a single $10 note.