01 - In a mixing bowl, whisk together the honey, lime juice, olive oil, minced garlic, cumin, chili powder, salt, black pepper, and lime zest until well combined.
02 - Place the chicken breasts in a large resealable bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is evenly coated. Marinate for at least 20 minutes at room temperature, or refrigerate for up to 2 hours for deeper flavor penetration.
03 - While the chicken marinates, combine the diced mangoes, red bell pepper, red onion, jalapeño (if using), cilantro, lime juice, and salt in a medium bowl. Toss gently, adjust seasoning to taste, and refrigerate until ready to serve.
04 - Preheat an outdoor grill or grill pan over medium-high heat. Lightly oil the grates to prevent sticking.
05 - Remove the chicken from the marinade, allowing any excess to drip off. Place on the hot grill and cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior has a nicely charred finish. Transfer to a plate and let rest for 5 minutes before slicing.
06 - Slice the rested chicken and arrange on plates. Spoon the mango salsa generously over the top and serve immediately.