01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Place halved radishes in a large bowl. Add minced garlic, olive oil, sea salt, black pepper, and dried thyme if using. Toss thoroughly until each radish half is evenly coated with the oil and seasonings.
03 - Spread the seasoned radishes in a single layer on the prepared baking sheet, cut sides facing down for even caramelization.
04 - Roast for 20 to 25 minutes, stirring halfway through the cooking time, until the radishes turn golden and yield easily when pierced with a fork.
05 - Transfer the roasted radishes to a serving dish and sprinkle with freshly chopped parsley if desired. Serve warm.