Boil. Wash the sweet potatoes and place them in a pot (skins on) and cover with water at room temperature; bring to a boil over high heat.
Reduce heat to medium-low and simmer until fork tender. It should take about 15-20 minutes depending on how big they are cut up into chunks (if using large potatoes).
Drain. Then use the same large pot and mash sweet potatoes by hand, using a potato masher.
Season. Add your seasonings: oil, herbs, and non-dairy milk, until you achieve your desired consistency.