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Place unpeeled potatoes in a large pot and add water until covered by about 1-inch. Add 1 tablespoon of salt. Place pot over high heat, cover, and bring to a boil. Reduce heat slightly to keep potatoes at a boil for about 15 minutes, or until tender when pierced with a sharp knife (but not falling-apart tender).
Meanwhile, preheat oven to 450 degrees F and coat a large rimmed baking sheet with non-stick cooking spray. Drain and transfer potatoes to prepared baking sheet, about 1-inch apart. Use a potato masher or the flat bottom of a clean glass to smash potatoes down lightly, keeping intact. Sprinkle with a little salt and pepper, drizzle with olive oil, sprinkle with Parmesan, and sprinkle with a little thyme or rosemary. Roast in preheated oven for 20 to 25 minutes until browned and crispy.