Preheat the oven to 400 degrees and line a large baking sheet with parchment paper.
In a small bowl, stir together the honey, Dijon mustard, olive oil, minced garlic, dried thyme, salt, and black pepper until smooth.
Place the pork tenderloin in the center of the prepared baking sheet and arrange the carrot pieces around it.
Brush the honey mustard mixture evenly over the pork, then drizzle the remaining mixture over the carrots and toss them lightly to coat.
Bake for 25 to 30 minutes, or until the pork reaches an internal temperature of 145 degrees.
Remove the pan from the oven and let the pork rest for 5 minutes before slicing.
Sprinkle the chopped parsley over the sliced pork and carrots before serving.