They are what the Japanese call "dorayaki", small round pancakes filled with red bean, soy bean or chestnut paste. There are 5 individally wrapped cakes in a plastic tray inside the bag.
These have red bean paste and little bits of crushed chestnuts poking through.
The pancake itself is dark brown and when broken in half is quite thick, but you can also see the air bubbles of where the cake has risen, so it's nice and fluffy. The filling is really generous too and is the right amount of paste to cake ratio.
These were great served with a cup of tea, my husband and I really enjoyed them. It was a nice sweet without being overly sweet.
The maker - Marukyo - make other such dorayaki treats that I have also seen around, so maybe I will try another type from them next time.