Heat the olive oil in a big soup pot.
Slice the cremini mushrooms and sauté in the olive oil.
When starting to soften, add the chopped onion.
After 2 minutes, add the chopped garlic.
Stir 1 minute.
Add the vegetable stock, water, and chopped fresh spinach.
Bring to a boil. Add the potatoes flakes and let simmer gently 10 minutes.
Grind a generous amount of black pepper and taste for salt, which will depend on the saltiness of your veg broth.
Serve with bread, ideally sourdough. Enjoy!