Heat the cast iron skillet. Seriously folks, if you are doing this in your kitchen make sure you have a heavy weight frying pan. A flimsy gourmet skillet will not work. Preheat the empty skillet over HIGH heat until it is searing hot. Brush both sides of the chicken breasts with oil.
Olive oil adds more flavor.
Place each piece of chicken in the plastic bag with spices and shake until thoroughly coated. Place each chicken breast on the searing hot skillet. Cook until it turns black. Turn over, cook on the other side until it turns black. Hence the name blacked chicken.