Preheat your oven to 400°F.
Trim any excess fat from the pork tenderloin and pat dry with a paper towel.
In a small bowl, mix the olive oil, mixed dried herbs, garlic powder, salt, and pepper.
Brush the tenderloin evenly with the herb-oil mixture.
Place the pork tenderloin in the center of a baking sheet.
Toss the Brussels sprouts and cubed sweet potato with a little extra olive oil, salt, and pepper, and spread them around the tenderloin on the baking sheet.
Roast in the preheated oven for 20-25 minutes, turning the vegetables halfway through. The pork should reach an internal temperature of 145°F.
Remove from the oven and let the pork rest for 5 minutes before slicing.
Serve the sliced pork tenderloin with the crispy Brussels sprouts and sweet potatoes.