Marks and Spencer's (the ones from the bakery!)
The cookie itself is thin and soft, ofset with lots of chunks of smooth velvety chocolate, making an irresitable cookie. They are freshly cooked and moist enough to bend when first cooked. They firm up a bit after a couple of hours.
Personally I prefer the Cookie with chocolate chunks, but they also do it with white chocolate chunks, and chocolate cookie with chunks.
49p each or about £2 for 5.