Preheat the oven to 200°C (400°F) and line a large baking tray with parchment paper.
Prepare the parsnips by peeling them and slicing into even batons—about the size of thick-cut fries for even cooking.
Parboil (optional but recommended): Place the parsnips in boiling water for 5 minutes, then drain well. This helps them get extra fluffy on the inside when roasting.
Coat with oil and honey: In a large bowl, toss the parsnips with olive oil, honey, salt, pepper, and thyme (if using). Make sure they’re evenly coated to encourage caramelization.
Arrange on tray: Spread them out in a single layer on the baking tray, leaving space between each piece so they roast instead of steam.
Roast until golden: Roast for 25–30 minutes, turning halfway through, until the parsnips are golden brown and tender inside.
Serve hot: Transfer to a serving dish and drizzle with any sticky pan juices for an extra burst of flavor—perfect alongside roast honey parsnips and carrots.