Scrub potatoes and dice them into similar sizes (skin on)
Run potatoes under cold water to wash extra debris from potatoes
In a large soup pot, saute onions, leeks, shallots, and garlic until onions are translucent.
Add a little vegetable broth to prevent onions, shallot, and leeks from sticking to the bottom of the pan.
Add all the potatoes, and cover with vegetable broth.
Add chopped rosemary and salt and pepper.
Add nutritional yeast
Stir.
Bring to a boil, and cover.
Reduce to simmer and cook for 30 minutes until potatoes are soft.
Turn off heat and allow to cool for about 10 minutes.
Be careful and put half the soup in a high-speed blender and blend until smooth.
Add back into the soup pot.
Reheat before serving.