Preheat oven to 425°F. Line baking sheet with parchment.
Peel carrots and parsnips. Cut into 3-inch sticks, ½ inch thick.
Place on baking sheet. Drizzle with olive oil. Season with salt and pepper. Toss.
Spread in single layer. Do not crowd.
Roast 20 to 25 minutes until tender and golden. Flip halfway through.
While vegetables roast, melt butter in skillet over medium heat.
Add maple syrup, brown sugar, thyme, and cinnamon. Stir.
Simmer 2 to 3 minutes until slightly thickened.
Transfer roasted vegetables to skillet with glaze.
Toss to coat completely. Cook 1 to 2 minutes.
Taste. Add salt if needed.
Transfer to serving dish. Garnish with herbs and flaky salt. Serve hot.