In a small bowl, mix the 1 tablespoon brown sugar, 1 teaspoon salt, 1 teaspoon pepper, ½ teaspoon garlic powder, and ½ teaspoon paprika.
In a large bowl, add 1 large diced ripe mango, ¼ cup diced red onion, 1 diced red bell pepper, 1 seeded and diced jalapeño, 2 tablespoons lime juice, 1 tablespoon fresh chopped cilantro, and salt and pepper to taste Stir to combine.
Brush the 4 salmon filets with the 1 tablespoon lime juice and rub with the prepared seasoning mixture.
Heat 1 tablespoon olive oil in a skillet over medium-low heat. Add the prepared salmon to the skillet skin side down. Cook for 5 minutes, then gently flip it over and cook for another 5 minutes. Cook until the internal temperature reaches 145 degrees Fahrenheit and it flakes easily with a fork.
Remove the cooked salmon from the skillet and serve with the mango salsa spooned on top!