Preheat your oven to 400°F (200°C). Pat the pork tenderloin dry with paper towels. This helps create a better sear and crust.
In a small bowl, combine the panko breadcrumbs, chopped parsley, rosemary, thyme, minced garlic, salt, and pepper. Mix well to create your herb crust mixture.
Heat the olive oil in an oven-safe skillet over medium-high heat. Sear the pork tenderloin on all sides until golden brown, about 2-3 minutes per side. This step locks in juices and adds flavor.
Remove the skillet from the heat. Brush the top and sides of the seared pork tenderloin with Dijon mustard. This acts as a binder for the herb crust.
Press the herb and panko mixture firmly onto the mustard-coated pork, ensuring an even coating all around.
Transfer the skillet to the preheated oven. Roast for 15-20 minutes, or until a meat thermometer inserted into the thickest part of the tenderloin registers 145°F (63°C).
Once cooked, remove the pork tenderloin from the oven and let it rest on a cutting board for 5-10 minutes before slicing. This allows the juices to redistribute, ensuring a moist and tender result.