In a medium-sized pot boil 4 cups of water. Add the cubed russet potato and 1/4 of the sweet potato. Reduce heat and cook until the potatoes are soft. Drain the water but keep the water for use later. Mash the potatoes, mix in nutritional yeast, and set aside.
In a large pot saute the shallots and garlic with a small amount of water for approximately 5 minutes or until the shallots are soft.
Add the potato water, remaining sweet potatoes, carrots, parsnip, and all the herbs. Bring to a boil and then reduce the heat to low and simmer for 20 minutes or until the vegetables are soft..
Once the vegetables are soft, stir in the mashed potatoes and cook for 5 minutes. Let the stew thicken. Add the peas and swiss chard and cook for 5 more minutes or until the chard is wilted and peas are heated through.
Serve.
Notes
Instead of swiss chard use spinach or collard greens. Add other vegetables if you wish.