Add potatoes to a pot and cover with water. Add in a big pinch of salt and boil until tender. Drain the potatoes and return them to the pot.
Add the non dairy milk to the potatoes and using a potato masher, mash the potatoes until they are to your desired consistency. Add in the avocado butter, salt, pepper, and scallions if using. Stir to combine and serve with extra dollops of avocado butter.