Preheat your oven to 400°F (200°C).
Peel and chop the carrots and parsnips into uniform 1-inch pieces.
Toss the root vegetables with half of the olive oil, salt, and pepper on a parchment-lined baking sheet.
Roast the vegetables for 20-25 minutes, tossing halfway through, until they are tender and caramelized.
While vegetables roast, finely mince the rosemary, thyme, and garlic, then rub the mixture evenly over the beef.
Heat the remaining olive oil in an oven-safe skillet over medium-high heat.
Sear the beef for 2 minutes on each side until a golden-brown herb crust forms.
Transfer the skillet to the oven and roast for 5-8 minutes, or until the internal temperature reaches your preferred doneness.
Remove the beef from the oven and let it rest for 5 minutes before slicing thinly against the grain to serve with the roasted vegetables.