01 - In a mixing bowl, whisk together the lime juice, lemon juice, olive oil, honey, minced garlic, salt, black pepper, oregano, red pepper flakes (if using), and chopped cilantro until well combined.
02 - Place the chicken breasts in a zip-top bag or shallow dish and pour the marinade over them. Seal or cover tightly and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor penetration.
03 - Preheat your grill to medium-high heat. Lightly oil the grates to prevent sticking.
04 - Remove the chicken from the marinade, discarding any remaining liquid. Grill the breasts for 5 to 6 minutes per side, until the internal temperature reaches 165°F and juices run clear.
05 - Transfer the chicken off the grill and let it rest for 5 minutes before slicing. Serve garnished with additional fresh cilantro and lime wedges if desired.