I know this might be a bit controversial, but if you've got a big enough mug and a big enough mouth, it's hard to beat the Mcvities Chocolate Caramel Digestive.
That layer of caramel really holds the whole thing together.
Hmmmmmmmmmmmmmmm.
.. we need a drooling emoticon for moments like this..
if you've got a bit enough mug you could just go for a wagon wheel.