Preheat your oven to 425°F (220°C).
Prepare the herb mixture by combining rosemary, thyme, garlic, salt, pepper, and mustard in a bowl.
Rub the olive oil over the pork tenderloin, then coat it with the herb mixture evenly.
Place the coated tenderloin on a roasting pan or baking sheet.
Roast the pork tenderloin for 25-30 minutes or until it reaches an internal temperature of 145°F (63°C).
Remove the pork from the oven and let it rest for 10 minutes before slicing.
Slice and serve with your favorite sides.