In a large pot of lightly salted boiling water, add potatoes and cook until tender, about 20 to 25 minutes. Drain and let sit for 10 minutes, or until still warm but cool enough to handle. Transfer the potatoes to a large bowl.
Heat the soymilk until steaming hot, either in a small saucepan on the stovetop or in the microwave.
Using a potato masher, mash the potatoes well. It''s okay if there are still some small chunks in them. Add half of the hot milk, the melted margarine, nutritional yeast flakes, parsley, garlic, salt and white pepper, mixing well. At this point, you can continue mixing by hand, or can use an electric hand mixer with beater blades. Add more hot milk if necessary, until the potatoes are soft and fluffy. Add freshly ground pepper to taste. Adjust seasonings and serve right away while hot.
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