Prepare the mushroom by removing small part of the bottom, rinse under water and set the aside.
In a large skillet add olive oil and heat it over medium heat.
Chopped the scallions, add them to the skillet and sauté, stir when needed.
Change to high heat, add the mushrooms to the skillet and cook for 3 minutes, stir when needed.
Then add the potatoes, celery and carrots and add seasoning such as salt and pepper. Sauté for another 3 minutes.
Add water to the skillet and bring it to boiling. Reduce the heat to medium heat, cover the skillet and cook for 45 minutes.
Just 5 minutes before you turn off the heat add the heavy cream and stir regularly.
Use a hand blender or pour the skillet over to a blender and mix for a few minute to reach a smooth creamy texture.