1. Wash potatoes, and rub with oil.
2. Bake at 400 degrees for 1 hour or until done.
3. Cut potatoes in half lengthwise.
4. Carefully scoop out pulp, leaving shells intact.
5. Mash pulp; stir in butter, 1 1/2 cups Cheddar cheese, sour cream, milk, parsley, salt, and pepper.
6. Stuff shells with potato mixture and sprinkle with remaining cheese.
7. Bake potatoes at 350 degrees for 20 minutes.