Preheat the oven to 400 degrees.  Pour the olive oil into a glass baking dish.  Add the salt and pepper and stir to combine.  Arrange the potato halves cut side down in the baking dish.  Bake until the potatoes are nicely browned on the bottom (about 40 minutes).  You can check for doneness by either lifting a potato with a spatula or by holding the glass dish overhead and looking through the glass.