Preheat the oven to 425 degrees.
Wash and dry your potatoes. Cut them in half. Make sure you can fit all the potato halves into the skillet.
Peel and mince the garlic. Set aside.
Begin preheating your cast iron skillet over high heat on the stove top.
Meanwhile, add the olive oil and potato halves to a bowl. Toss potatoes to coat.
Strain the oil into the skillet. Do not add the potatoes; leave them in the bowl.
Heat the olive oil in the skillet until it is very warm. Add the minced garlic and salt, stirring around.
Brown the garlic in the oil. This will happen quickly, within a couple of minutes. Garlic should be browned completely but not crispy or burnt.
Turn off the stovetop heat. Arrange the potatoes cut side down in the skillet.
Carefully add the skillet to the oven.
Roast in the oven for 15 minutes. Do not turn or stir the potatoes.
Remove from the oven. Serve hot, spooning the garlic bits and olive oil over the potatoes.