Boil the peeled and cubed potatoes until soft, about 15-20 minutes. You can tell the potatoes are done if you poke them with a fork and they are soft. Drain, add the potatoes back to the pot and add the plant milk, dairy-free butter, dairy-free sour cream or yogurt (if using), garlic salt and pepper to taste. Turn the heat to low and mash the potatoes with a potato masher or fork until you achieve your desired texture. You can use a hand beater, or immersion blender but be sure to use it on low because if you beat them too much they become gummy and lose their fluffiness. Add a little bit more milk if you need to make them smoother, if you don’t like lumps. Garnish with fresh chives, parsley or other herb of choice and serve!