In a medium bowl, whisk together the sesame oil, soy sauce, honey, lime juice, minced garlic, grated ginger, and crushed red pepper flakes until well combined.
Place the chicken breasts in a large resealable plastic bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is well coated. Seal the bag or cover the dish, and refrigerate for at least 1 hour, preferably 4 hours for enhanced flavor.
Preheat the grill to medium-high heat. Remove the chicken from the marinade and let the excess drip off. Discard the marinade.
Grill the chicken for about 6-7 minutes on each side or until the internal temperature reaches 165°F (75°C) and the chicken has nice grill marks.
In the last minute of grilling, sprinkle sesame seeds on each piece of chicken and close the grill lid to toast them slightly.
Once cooked, remove the chicken from the grill and let it rest for 5 minutes before slicing.
Garnish with fresh cilantro and serve with lime wedges on the side for an extra burst of flavor.
Notes
For best flavor, marinate the chicken for at least 4 hours.