Stir together the chili powder, oregano, paprika, celery seeds, kosher salt and thyme.
Brush 1 tablespoon of olive oil over both sides of the chops and use your fingers to add the rub. Chill the pork for at least 8 hours.
Before cooking allow the pork to come up to room temperature, for at least a half an hour.
Preheat the oven to 400 degrees. Place the cast iron skillet in the oven while it is preheating.
Remove the cast iron skillet from the oven and place on a stove top burner over medium high heat. Add 1 tablespoon of olive oil and sear one side of the pork chops for 3 minutes. After a minute reduce the heat to medium and continue cooking until browned.
Flip the pork chops and place the entire cast iron skillet in the oven for 6 to 8 minutes, depending on the thickness of the meat.
Remove the cast-iron skillet from the oven and transfer the pork chops to a plate and allow them to rest for 5 to 6 minutes before serving.