Clean, wash and halve the Brussels sprouts and cook in boiling salted water for about 15 minutes. Peel and finely dice the onion. Heat the oil in a pan. Fry the potato noodles for about 5 minutes.
Pour the Brussels sprouts into a sieve and drain. Add the onion and Brussels sprouts to the noodles and fry for about 2 minutes. Add cream, bring to the boil, season to taste with salt, pepper and nutmeg.
Leave the ham in a pan until crispy. Cut cheese into cubes and spread over Brussels sprouts and noodles. Cover and let stand for 2-3 minutes until the cheese has melted. Wash parsley, shake dry and chop finely.
Arrange the potato noodle and Brussels sprouts pan, sprinkle with ham and parsley.