Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Trim any excess fat from the beef sirloin and pat the surface completely dry with a paper towel.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a small bowl, whisk together 1 teaspoon of the olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper.
Rub the herb and garlic mixture evenly over all sides of the beef sirloin to create a flavorful crust.
Toss the green beans and sliced carrots with the remaining teaspoon of olive oil directly on the prepared baking sheet.
Place the seasoned beef in the center of the baking sheet, surrounding it with the vegetable medley.
Roast for 20-25 minutes, or until the beef reaches an internal temperature of 135°F for medium-rare.
Remove from the oven and let the beef rest on a cutting board for 10 minutes before slicing thinly against the grain.