01 - Preheat the oven to 430°F. Line a large baking tray with parchment paper or lightly oil it.
02 - In a large bowl, toss peeled and cut parsnips with olive oil, sea salt, black pepper, and dried thyme or rosemary if desired.
03 - Spread parsnips in a single layer on the prepared baking tray, avoiding crowding.
04 - Roast for 20 minutes until edges begin to brown.
05 - Turn each parsnip baton to ensure even browning on all sides.
06 - Return to the oven and roast for an additional 15 minutes until deep golden and crisp outside yet tender inside.
07 - If preferred, sprinkle grated Parmesan over hot parsnips and garnish with chopped parsley before serving.