Prepare the Salsa: In a medium bowl, combine the diced mango, pineapple, red bell pepper, red onion, jalapeño, and cilantro. Drizzle with lime juice and season with salt and pepper. Mix gently and set aside for the flavors to meld.
Season the Chicken: Pat the chicken breasts dry with a paper towel. Rub them with olive oil, and season both sides with ground cumin, salt, and pepper to taste.
Cook the Chicken: Heat a grill or stovetop grill pan over medium-high heat. Add the chicken breasts and cook for about 6-7 minutes on each side or until the chicken is cooked through (internal temperature should reach 165°F / 75°C).
Rest the Chicken: Remove the chicken from the grill and let it rest for 5 minutes to retain its juices.
Serve: Place the grilled chicken breasts on a serving platter. Top each piece with a generous scoop of the pineapple mango salsa.
Notes
Let the salsa sit for a few minutes to enhance the flavors.