Brush both sides of each chicken breast half with olive oil.
Dip both sides of each half of chicken breast in spice mix.
Heat grill to 500 degrees. Once it reaches 500 degrees, turn it down to 450 degrees (this is the trick for cooking thin chicken, cook it high and fast).
Once grill has been turned down, put 1-2 tbsp olive oil in cast iron skillet. Place skillet on grill.
Place chicken in skillet. Grill 3-4 minutes on each side until cooked through.
Notes
Disclaimer: I have never used a grill in my life. And I doubt I will. All grill instructions came from my hubs.