Cook the spaetzle in salted water for about 16 minutes.
In the meantime, cut the pointed cabbage into strips. Halve the mushrooms. Heat 20 g butter in a pan, steam the cabbage in it over high heat for 5 minutes while turning. Season with salt, pepper and nutmeg. Remove.
Fry the mushrooms in 25 g of hot butter. Deglaze with broth. Bring to the boil, remove from heat and stir in crème fraîche. Spice up.
Drain the spaetzle, put half of it in a greased baking dish, sprinkle with 100 g cheese. Top with the pointed cabbage and mushrooms. Spread the rest of the spaetzle on top, sprinkle with the remaining cheese.
Gratinate in a hot oven at 225 ° C top / bottom heat for about 10 minutes.
Cut the onions into rings, fry them in 15 g butter until golden brown and place on the finished spaetzle.