1. Preheat oven to 450 degree F and place a baking pan on rack in lower third.
2. Toss together all ingredients in a bowl; season with salt and pepper. Carefully transfer potatoes to hot pan, shaking pan to spread potatoes into a single layer.
3. Roast potatoes, stirring occasionally, until tender and crispy, about 35 minutes. Transfer to a serving bowl and garnish with thyme sprigs, if desired. Makes 8 servings.