In a blender, combine the zucchini, sugar, egg, flour, evaporated milk (or vegan evaporated milk), butter, vanilla, and salt. Blend well, then pour into an 8-inch unbaked pie shell. You may add another half cup of milk, oatmilk, or half and half to fill the custard in the pie shell. Sprinkle the top with cinnamon and nutmeg.