Clean and trim the mushrooms. Cut shiitake into slices, halve mushrooms. Halve or quarter oyster mushrooms depending on size. Peel and halve onions and cut into slices.
Clean, wash and cut the spring onions into rings. Heat the fat in a large pan. Add potato noodles and fry for about 5 minutes, turning them carefully several times, until golden brown.
Heat the oil in a frying pan. Fry the mushrooms and onions for about 5 minutes. Add spring onions and dust with flour. Add cream and 150 ml water, simmer for 2-3 minutes. Season to taste with salt, pepper and nutmeg.
Add potato noodles and heat up briefly. Garnish with cranberries if desired. Serve immediately.