Begin by putting cashews and water in a blender and set aside.
Next, chop your potatoes into chunks, add to a large pot and fill with water until potatoes are covered. Put pot on stove and boil potatoes until fork tender, about 15-20 minutes.
While your potatoes are boiling, put unpeeled garlic in a heavy skillet over high heat. Turn every now and then, until peel starts to brown, about 10-15 minutes. Set aside an allow to cool before removing the peel and mincing.
To make the cashew cream, blend the cashews, water and nutritional yeast until creamy, about 1-2 minutes, depending on your blender.
When the potatoes are done, drain. Then place them in a large mixing bowl and mash with a potato masher until they have reached your desired texture. Add the cashew cream and minced garlic and stir until smooth and evenly mixed.