For the noodles, boil up about 3 l salted water (about 1 teaspoon salt per litre). Meanwhile peel onion and garlic and chop finely. Sort the spinach, wash well and drain.
Cook the pasta in boiling salted water according to the instructions on the packet. Heat the oil in a large pan. Sauté onion and garlic in it. Add dripping wet spinach.
Steam spinach for 3-4 minutes while stirring until it has collapsed and the liquid has evaporated. Season with salt, pepper and nutmeg.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Grease a well closing springform pan (approx. 20 cm Ø). Wrap 2 sheets of aluminium foil around the outside of the mould.
Drain the pasta. Finely grate the parmesan. Mix eggs, cream, ricotta and parmesan, up to 2 tablespoons. Season well with salt and pepper. In a saucepan, mix the pasta, spinach and egg cream.
Pour everything into the mould, sprinkle with 2 tablespoons of Parmesan cheese. Cover with aluminium foil and bake in a hot oven for 45-50 minutes. Bake the last 15 minutes without foil. Remove from the tin and arrange.