01 - Pat the chicken breasts completely dry with paper towels to ensure proper seasoning adhesion and crust formation.
02 - Combine smoked paprika, garlic powder, onion powder, dried thyme, dried oregano, cayenne pepper, black pepper, and kosher salt in a small bowl. Mix thoroughly to distribute spices evenly.
03 - Brush both sides of each chicken breast with olive oil or melted butter. Generously rub the spice mixture over all surfaces, pressing firmly to ensure the seasoning adheres properly.
04 - Place a large cast-iron skillet over medium-high heat and allow it to become very hot, approximately 3 minutes. Proper pan temperature is crucial for developing the characteristic blackened crust.
05 - Arrange chicken breasts in the hot skillet without overcrowding. Cook undisturbed for 4 to 5 minutes until a dark, flavorful crust forms. Turn each breast and continue cooking for an additional 4 to 5 minutes, or until the internal temperature reaches 165°F.
06 - Transfer chicken to a cutting board and let rest for 3 minutes to allow juices to redistribute throughout the meat. Slice and serve immediately with fresh lemon wedges.