My mother-in-law has taken us a few times to a Chinese restaurant over in Grenzach called
China Restaurant Palast, which advertises that they have free deliveries into Switzerland for orders over 40€ ...
They delivered a flier to my building just a few days ago so I know they come at least this far (from Grenzach to Kannenfeld is a bit further than a skip in the park), I do not know exactly what their delivery boundaries are however.
The food is pretty good, we've been for lunch menu (quite cheap at < 10€ per meal) and I have not been disappointed. They also offer an all-you-can-eat buffet for Sunday and holiday lunches as well as in the evenings, but I've not been for that.