Cook the gnocchi in plenty of salted water according to the instructions on the packet, drain and drain.
Clean the chanterelles. In a hot pan, fry the cubes of bacon in the oil. Add onion and chanterelles and fry vigorously for 2 minutes. Deglaze with the vegetable stock and let it simmer for 3 minutes. Add the crème fraiche and reduce until creamy. Cut the sage into fine strips. Add with the gnocchi to the sauce. Serve sprinkled with the grated cheese.