Preheat oven to 400F.
Rub turkey tenderloins with Cajun spice.
Heat a cast iron skillet on medium (or any other skillet) until hot and pour olive oil in pan.
Sear turkey tenderloin on one side until golden brown. Turn turkey tenderloin over. Put pan in the oven for 10-15 minutes depending on the size of the turkey tenderloin.
Cook to the interior temperature of the turkey tenderloin is 165F. Enjoy hot or let cool.
Slice for sandwiches and keep for in the refrigerator. Keeps 5 days.