I was delighted to find a shop of the Basic chain during my holiday in Aachen. And it did not disappoint: there were many vegan products on offer, such as yoghurt, musli bars, cookies and so on. Apart from that, there are many things that are naturally vegan: nuts, fruit and almost everything you can think of. I also really liked the atmosphere in the shop, it's very spacious and bright, so it's a very nice shopping experience.
Cons: Sells meat products - read the labels!