Preheat the oven to 350°F. Line a rimmed baking sheet with parchment or aluminum foil or easy clean up. Set aside.
Pat the 4 salmon fillets dry with a paper towel, season with the 1/2 teaspoon coarse Kosher salt and 1/2 teaspoon ground black pepper . Place them on the prepared baking sheet.
In a small bowl, combine 4 tablespoons light brown sugar, 4 tablespoons Dijon mustard, 1 tablespoon vegetable oil and 1/2 teaspoon chili powder until it forms a paste, baste onto the salmon.
Cook for 15 minutes, or until easily flaked with a fork and it reaches an internal temperature of 125°F for medium rare.
Top with the 2 tablespoons French fried onion strings and snipped 1 tablespoon chives.
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