Slather the pork tenderloins with the dijon mustard, coating completely. Season with the garlic, thyme, rosemary, salt and pepper all over.
Heat oil in a large cast iron (or oven safe skillet) over medium-high heat. Sear the pork tenderloins on all sides, until nicely browned. Sprinkle tops of tenderloins with the shredded parmesan cheese.
Carefully transfer skillet to preheated oven and cook until internal temperature of pork reaches 140 degrees F. (approximately 10 to 15 minutes). When finished carefully remove pan from oven and loosely cover with foil and let rest for 5 to 10 minutes. Slice into 1 inch medallions and enjoy.
Notes
*If using fresh herbs in place of dried herbs, increase to 2 tsp of each.