Preheat your oven to 200°C (400°F). Gather your baking sheet and mixing bowl to prepare for roasting.
Wash and peel the carrots, then cut them into 2-3 inch long pieces that are similar in size for even roasting.
Pick the thyme leaves from the stems and add them to a mixing bowl along with the carrots, olive oil, salt, and freshly cracked black pepper. Toss everything together until the carrots are evenly coated and fragrant.
Spread the coated carrots out in a single layer on your baking sheet, leaving space between pieces to promote browning.
Place the baking sheet in the oven and roast for 25-30 minutes. Shake or flip the carrots halfway through to ensure even caramelization and browning.
Check the carrots at around 25 minutes; they should be tender, with caramelized edges and a fragrant herbal aroma. If needed, roast a few more minutes until perfectly golden.
Remove from the oven and, if desired, drizzle with a little honey and sprinkle with lemon zest for brightness. Toss gently to combine.
Transfer the carrots to a serving dish and garnish with fresh thyme leaves if you like. Serve warm and enjoy the tender, caramelized texture with herbal brightness.