This is an entry for Iron Cupcake: Coffee (if you don't know Iron Cupcake, check it out, it's a fun monthly baking competition run by Milwaukee Cupcake Queen) by Fields of Cake (go there for the recipe). All I can really say is wow - it looks amazing.
Fields of Cake describes this cupcake on Flickr as:
This cupcake is Bliss in a paper cup... Banana cake, filled with caramel coffee custard and a piece of homemade smoked sea salt toffee, topped with coffee liqueur milk chocolate sauce, coffee liqueur latte buttercream and another shard of homemade toffee. I am barely able to describe to you the joy that this cupcake brought my mouth!