Bring a large pot of lightly salted water to a boil. Add the cubed potatoes and boil for 10-15 minutes, until fork-tender. Drain the potatoes in a colander. Transfer potatoes to a mixer with the whip attachment in place. Add the milk, butter, sour cream, basil, oregano, salt & pepper. Whip for several minutes, just until potatoes are creamy in texture. Sprinkle with chopped fresh parsley, if desired.