Marinate the chicken: whisk olive oil, lime juice, honey, garlic, chili powder, salt, and pepper. Add chicken and coat well. Marinate 20 minutes to 4 hours.
Make the salsa: combine mango, red bell pepper, red onion, jalapeño, cilantro, lime juice, and a pinch of salt. Stir gently and set aside.
Cook the chicken: grill or sear over medium heat for 5 to 7 minutes per side, until browned and cooked through to 165 degrees F.
Rest and slice: transfer chicken to a cutting board and rest 5 minutes, then slice.
Serve: spoon mango salsa over the chicken and serve with rice, greens, or warm tortillas.