01 - Combine smoked paprika, garlic powder, onion powder, thyme, oregano, cayenne, black pepper, and salt in a small bowl. Mix thoroughly to ensure even distribution of spices.
02 - Pat salmon fillets completely dry with paper towels to ensure proper searing. Brush both sides generously with olive oil, then press the spice mixture evenly onto all surfaces of the fish.
03 - Heat a large cast-iron skillet or non-stick pan over medium-high heat until properly hot. Add seasoned salmon fillets and cook undisturbed for 3 to 4 minutes per side, developing a dark, crispy crust while keeping the interior moist and just cooked through.
04 - In a medium bowl, gently combine diced mango, avocado, red onion, jalapeño, cilantro, and lime juice. Season with salt and pepper to taste, being careful not to mash the avocado.
05 - Place blackened salmon fillets on serving plates. Top each fillet with a generous portion of mango avocado salsa. Serve immediately with lemon wedges on the side for squeezing over the fish.