Bring 1/2 litre of water to the boil in a saucepan. Add the contents of the bag, stir and let it simmer for 6-8 minutes at medium heat. In the meantime clean, wash and cut leek into rings.
Dice the bacon. Wash, clean and halve the mushrooms. Heat the oil in a pan and fry the fried potatoes, bacon, leek and mushrooms for about 10 minutes while turning them until crispy. Season with salt and pepper.
In the meantime, wash parsley, dab dry and chop finely, except for a little to garnish. Serve the pan sprinkled with crème fraîche and parsley. Garnish with the rest of the parsley.