1. 1. Wash and peel the potatoes. In a saucepan, cook the potatoes in salted water for 20 minutes.
2. 2. Meanwhile, briefly rinse the mushrooms. Cut off the mushroom stems and quarter them.
3. 3. Peel the garlic cloves and chop them.
4. 4. Check the potatoes' doneness with the tip of a knife.
It should easily go into the potato while still offering slight resistance.
Rinse the potatoes with cold water and cut them into large cubes.
5. 5. In a skillet, sauté the diced potatoes in oil and butter. When they start to brown, add the mushrooms with the garlic.
6. 6. Cook until the water released by the mushrooms evaporates.
7. 7. Chop 6 sprigs of parsley. Adjust the seasoning and add the parsley to the mixture.
8. 8. Finish cooking for 2 minutes. Serve in a dish and sprinkle with grated Parmesan.