Bring Tenderloin to Room Temperature:
Let beef sit at room temperature for 30–45 minutes before roasting. Preheat oven to 450°F (230°C).
Make Garlic Herb Rub:
In a small bowl, combine olive oil, garlic, rosemary, thyme, salt, and pepper. Pat the tenderloin dry, then rub all over with Dijon mustard (if using) followed by the herb mixture.
Sear (Optional):
For an extra flavorful crust, sear the beef in a hot skillet with a little oil for 2–3 minutes per side before roasting.
Roast:
Place tenderloin on a rack in a roasting pan or on a baking sheet. Roast for 35–45 minutes, or until internal temperature reaches:
120–125°F for rare
130–135°F for medium-rare
140–145°F for medium
Rest the Meat:
Remove from oven and loosely tent with foil. Let rest for 15–20 minutes before slicing to allow juices to redistribute.
Slice & Serve:
Cut into ½–1 inch slices. Serve with your favorite sauce—garlic butter, red wine reduction, or horseradish cream.