Mix flour, eggs, 1 teaspoon of salt, nutmeg and mineral water to a thick dough. Let dough rest for about 1 hour. In the meantime, grate cheese finely. Boil up plenty of salted water.
Little by little, put a part of the spaetzle dough on the moistened "spaetzle board" and scrape fine strips into the boiling salted water with a long knife. Bring to the boil until the spaetzle rise.
Remove the spaetzle with a skimmer and rinse briefly in a sieve under cold water. Drain and keep warm. Process the remaining dough in the same way. Mix the spaetzle with the cheese and put it into an ovenproof dish.
Bake in a preheated oven (electric oven: 200 °C/ gas: level 3) until the cheese has melted. Peel onions and cut into thin rings. Halve bacon slices, fry in a pan and remove.
Add fat to the frying fat and fry the onions in it until golden brown. Spread the bacon and onions over the cheese noodles. Garnish with parsley. A mixed salad tastes good with it.