Melting Potatoes

Position rack in upper third of oven; preheat to 500 degrees F.

Toss potatoes, butter, oil, thyme, rosemary, salt and pepper in a large bowl. Arrange in a single layer in a 9-by-13-inch metal baking pan. (Do not use a glass dish, which could shatter.) Roast, flipping once, until browned, about 30 minutes.

Carefully add broth and garlic to the pan. Continue roasting until most of the broth is absorbed and the potatoes are very tender, about 15 minutes more. Serve hot.