Cook the spaetzle in boiling salted water for 15-20 minutes. Clean, wash and cut leek into rings. Clean chanterelles and possibly cut them into smaller pieces. Fry bacon in a pan without fat until crispy. Take out.
Fry chanterelles and leek in bacon fat for about 5 minutes. Season with salt and pepper. Drain spaetzle and let drain well. Wash parsley, dab dry and chop. Mix oil, vinegar and cream. Add parsley. Season with salt, pepper and sugar. Chop bacon coarsely. Mix warm spaetzle with warm vegetables, bacon and the parsley-cream vinaigrette.
Mix oil, vinegar and cream. Add parsley. Season with salt, pepper and sugar. Chop bacon coarsely. Mix warm spaetzle with warm vegetables, bacon and the parsley-cream vinaigrette. Serve still warm.