01 - In a small bowl, combine the rosemary, thyme, parsley, garlic, smoked paprika, sea salt, black pepper, cayenne pepper if using, olive oil, and lemon zest. Mix thoroughly until a thick, fragrant paste forms.
02 - Pat the chicken breasts dry with paper towels. Rub the herb paste evenly over each breast, coating all surfaces. Allow the chicken to marinate for at least 10 minutes at room temperature, or refrigerate for up to 2 hours for deeper flavor penetration.
03 - Preheat your outdoor grill or grill pan to medium-high heat, approximately 400°F. Ensure the grates are clean and lightly oiled to prevent sticking.
04 - Place the seasoned chicken breasts on the hot grill. Cook for 6 to 8 minutes per side until the internal temperature reaches 165°F and the exterior develops a nicely charred crust.
05 - Transfer the grilled chicken to a serving platter. Loosely tent with aluminum foil and let it rest for 5 minutes to allow the juices to redistribute throughout the meat.
06 - Serve the chicken with lemon wedges alongside and a generous sprinkle of freshly chopped parsley for garnish.