Whisk honey, lime juice, olive oil, garlic, cumin, smoked paprika, salt, and pepper in a bowl. Add chicken and coat thoroughly. Cover and refrigerate 15 minutes up to 2 hours.
Combine diced mango, red onion, jalapeño (if using), cilantro, and lime juice in a bowl. Season with a pinch of salt, toss gently, and chill until serving.
Heat a grill or skillet over medium-high. Grill or sear chicken 4–6 minutes per side until caramelized and internal temperature reaches 165°F (74°C). Rest 5 minutes, then slice.
Place sliced chicken on plates, spoon mango salsa over the top, garnish with cilantro and lime wedges, and serve with rice or tortillas.
Notes
Substitute pineapple or ripe peaches for mango if out of season.
Marinate up to 2 hours for best flavor; avoid much longer as the lime can start to cure the chicken.
Salsa can be made a few hours ahead but dress with lime juice just before serving to keep fruit texture.