Preheat the grill to medium-high heat and lightly oil the grates.

In a small bowl, mix olive oil, lime juice, garlic, salt, pepper, and ground cumin or chili powder (if using). Brush the mixture onto both sides of the salmon fillets.

Place the salmon fillets on the grill, skin-side down first, and grill for about 4–5 minutes per side or until the salmon easily flakes with a fork.

While the salmon grills, prepare the mango salsa by combining diced mango, red bell pepper, red onion, cilantro, minced jalapeño (if using), lime juice, and salt in a bowl. Mix well and refrigerate until ready to serve.

Once the salmon is cooked, remove it from the grill and let it rest for a few minutes.

Top each salmon fillet with a generous scoop of mango salsa and serve immediately.