Peel the potatoes if desired. Then, cut them into quarters.
Add potatoes to a large pot. Fill with cold water, about an inch or two above the potatoes. Bring to a boil and let cook until the potatoes are soft and fork-tender, about 12-16 minutes.
Carefully drain the potatoes into a colander. Then, put the potatoes back into the warm pot.
Mash potatoes with a potato ricer or potato masher.
Add in the frothed plant milk, warm vegetable stock, vegan mayo, vegan butter Stir well.
If you think the potatoes need more moisture, add more vegan mayo.
Garnish with fresh chives. Add salt and pepper to taste.