01 - In a mixing bowl, whisk together honey, lime juice, olive oil, minced garlic, cumin, chili powder, salt, black pepper, and lime zest until well combined.
02 - Place chicken breasts in a large resealable bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is thoroughly coated. Marinate for at least 20 minutes, or up to 2 hours refrigerated for deeper flavor penetration.
03 - While the chicken marinates, combine 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 grill or grill pan over medium-high heat and lightly oil the grates. Remove chicken from the marinade, allowing excess to drip off. Grill for 6 to 7 minutes per side until fully cooked through with visible char marks.
05 - Transfer grilled chicken to a cutting board and let rest for 5 minutes to retain juices. Slice and serve topped generously with the chilled mango salsa.