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, or up to 2 hours in the refrigerator 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 a 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. Grill for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is nicely charred. Let the chicken rest for 5 minutes before slicing.
06 - Slice the rested chicken and serve topped generously with the chilled mango salsa.