Preheat the grill to medium-high heat. In a small bowl, mix olive oil, garlic powder, paprika, salt, and pepper. Brush the mixture over both sides of the chicken breasts.
Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Remove from the grill and let it rest for 5 minutes before slicing.
In a large bowl, combine the mixed salad greens, diced mango, red bell pepper, red onion, avocado, and cilantro.
Slice the grilled chicken and add it to the salad. Drizzle with lime juice and honey, if using. Toss gently to combine all ingredients.
Serve immediately or chill in the refrigerator for 15-20 minutes for a refreshing cold salad.