Peel, wash and cut potatoes into small pieces.
Peel and chop onion and garlic and put in a pot along with 40 ml of water. Bring to a boil and then cook for about 5 minutes. Add sliced potatoes and fry for about a minute.
Add sliced mushrooms and fry for another 1-2 minutes.
Add 500 ml of water and all the spices and bring to a boil. Cook over medium heat for about 25 minutes.
When vegetables are cooked, blend them into a smooth, creamy soup with a stick mixer or in an electric blender.
Pour it back into the pot, add nutritional yeast and soy sauce, mix and serve.