1. Microwave until paring knife or skewer slips in and out of potatoes easily. This will be less time than to cook them fully, so you have to check them a couple of times.
2. Preheat oven to 450 degrees. Drizzle olive oil over potatoes and roll to coat. Space potatoes evenly on baking sheet and place second baking sheet on top; press down firmly on baking sheet, flattening potatoes until 1/3 to 1/2 inch thick. Sprinkle with thyme leaves and season generously with salt and pepper; drizzle evenly with some more oil. Roast potatoes on top rack 15 minutes. Transfer potatoes to bottom rack and continue to roast until well browned, 20 to 30 minutes longer. Serve immediately.