Preheat oven to 425ºF. Place potatoes onto large rimmed baking sheet. Sprinkle with oil and salt and pepper and mix well, coating potatoes evenly. Spread potatoes out, cut sides down, in a single layer.
Place in preheated oven and bake for 30 minutes or until bottoms of potatoes are crispy and brown. Serve immediately.
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Notes
If potatoes seem to be sticking to the baking sheet after 30 minutes, they aren’t ready yet. Stick them back into the oven for 5 or more minutes and check them again.