Preheat oven to 425°F.
Toss potatoes generously in olive oil and season with salt, pepper, garlic and half of the rosemary. Arrange loosely on a baking sheet so that the potatoes are not crowded. Roast at high heat for 35-45 minutes, tossing and rearranging once or twice, until browned and crispy. Remove garlic cloves and toss with remaining rosemary. Season with additional salt and pepper as needed.
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