01 - Preheat a large cast-iron skillet over medium-high heat until very hot, about 5 minutes.
02 - Pat chicken breasts dry with paper towels to ensure even seasoning and better sear.
03 - Combine smoked paprika, garlic powder, onion powder, dried thyme, dried oregano, cayenne pepper, black pepper, and kosher salt in a small bowl.
04 - Brush both sides of each chicken breast with olive oil or melted butter.
05 - Generously coat each chicken breast on all sides with the spice mixture, pressing gently to help the spices adhere to the surface.
06 - Place chicken breasts in the hot skillet and cook undisturbed for 4 to 5 minutes until a dark, almost black crust forms on the bottom.
07 - Flip the chicken and cook for another 4 to 5 minutes, or until the internal temperature reaches 165°F and juices run clear.
08 - Remove chicken from heat and let rest for 2 to 3 minutes before serving to allow juices to redistribute.
09 - Slice and serve hot, garnished with fresh chopped parsley and lemon wedges as desired.