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