01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Arrange the salmon fillets on the prepared baking sheet. Drizzle with olive oil and rub evenly with garlic powder, paprika, salt, and black pepper. Place a lemon slice atop each fillet.
03 - Bake the fillets for 12 to 15 minutes until the flesh turns opaque and flakes easily with a fork.
04 - While salmon bakes, combine diced mango, red bell pepper, red onion, cilantro, jalapeño if using, lime juice, and salt in a medium bowl. Stir gently to mix, then set aside.
05 - Remove salmon from the oven and allow it to rest for 2 minutes.
06 - Spoon the mango salsa generously over each salmon fillet before serving.