For the rub, combine all ingredients in a small bowl and stir well to combine. Set aside.
Place chicken breasts on a plate or shallow pan. Pat dry with paper towels. Sprinkle liberally with the rub, then rub it in with your hand. Allow breasts to sit with the rub on for 15-30 minutes, at room temperature.
Heat 2 tablespoons of oil in a cast iron or heavy stainless steel pan over medium heat for two minutes. Oil should be fairly hot, but not at the smoking point. Make sure the pan is large enough to accommodate all of the breasts without crowding.