Allow your pork tenderloin(s) to sit on your counter (unopened) for 30 minutes to come to room temperature and allow even cooking.
Just before cooking, pat the tenderloin(s) dry, season with salt and pepper and then season with blackening season, patting it on.
Preheat your oven to 350 degrees.
In a large skillet or griddle, heat 1-2 TBS of oil (just enough to cat your pan lightly) until it gets hot. I can always tell when the oil begins to have tiny "waves" or shimmer. Add your seasoned pork tenderloin (you should hear it hit the pan with a nice sizzle.).
Cook each side for 2 minutes, then using tongs, allow the short side of each end of the tenderloin to sear for 45-60 seconds. Adding a small amount of additional oil if needed.
Quickly place the meat into a baking dish or pan and finish it off in your preheated oven. For 15-25 minutes (depending on the size of your tenderloin) or until internal temp reaches 145.
Remove pork, allow it to sit on the counter for 4-5 minutes, slice and enjoy!