Preheat your oven to 375°F (190°C) and line a baking sheet with aluminum foil, lightly coating it with cooking spray or olive oil.

In a small mixing bowl, combine extra virgin olive oil, minced garlic, chopped rosemary, kosher salt, and freshly ground black pepper until well-blended.

Pat the beef tenderloin dry and rub the garlic-rosemary mixture all over, ensuring it's well-adhered.

Place the seasoned tenderloin onto the prepared baking sheet and roast in the oven for approximately 45 minutes to 1 hour.

Once roasted, let the tenderloin rest for about 10 minutes to allow juices to redistribute.

Slice the tenderloin against the grain into thick pieces and serve.