Prepare the Carrots: Preheat the oven to 425°F (220°C). Peel the carrots, trim the ends, and cut them into evenly sized sticks about 2–3 inches long. If the carrots are thick, cut them in half lengthwise so they roast evenly.
Make the Maple Glaze: In a small bowl, whisk together the maple syrup, melted butter, olive oil, Dijon mustard, garlic powder, salt, and black pepper until combined.
Coat the Carrots: Place the prepared carrots in a large mixing bowl. Pour the maple mixture over them and toss until every piece is evenly coated.
Arrange on the Baking Sheet: Line a large baking sheet with parchment paper. Spread the carrots in a single layer, leaving a little space between the pieces to encourage roasting rather than steaming.
Roast Until Tender: Place the baking sheet in the preheated oven and roast for 15 minutes. Remove the pan and turn the carrots with a spatula so they brown evenly.
Add the Herbs: Sprinkle the fresh thyme over the carrots and return the baking sheet to the oven. Roast for another 10–15 minutes, until the carrots are fork-tender and lightly caramelized around the edges.
Coat with the Pan Glaze: Remove the carrots from the oven and gently toss them in the maple glaze collected on the baking sheet. Taste and adjust the seasoning if needed.
Garnish and Serve: Transfer the carrots to a serving platter and sprinkle with chopped fresh parsley. Serve warm with any remaining glaze spooned over the top.