01 - Preheat a large cast-iron skillet over medium-high heat until very hot, approximately 5 minutes.
02 - Pat chicken breasts thoroughly dry with paper towels to ensure proper spice adhesion.
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, then generously coat with the spice mixture, pressing gently to adhere.
05 - Place chicken breasts in the hot skillet and cook undisturbed for 4 to 5 minutes until a dark, nearly blackened crust forms.
06 - Flip the chicken and cook another 4 to 5 minutes, or until the internal temperature reaches 165°F and juices run clear.
07 - Remove from heat and let rest for 2 to 3 minutes before slicing and serving hot, garnished with fresh parsley and lemon wedges if desired.