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 thyme if using. Toss thoroughly until all radishes are evenly coated with the seasoning mixture.
03 - Spread the seasoned radishes in a single layer on the prepared baking sheet, ensuring even spacing for proper 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 fresh chopped parsley if desired. Serve immediately.