Preheat the oven: Set to 400°F (200°C). Line a rimmed baking sheet with foil or parchment and lightly oil it.
Pat the salmon dry: Use paper towels to remove surface moisture.
This helps the glaze stick and caramelize.
Season the fish: Sprinkle a small pinch of salt and pepper on the flesh side. If your fillets are thin, go easy on the salt.
Mix the glaze: In a small bowl, combine brown sugar, melted butter, garlic, soy sauce, lemon zest, lemon juice, and red pepper flakes if using. Stir until smooth and syrupy.
Coat the salmon: Place fillets skin-side down on the prepared sheet.
Spoon the glaze evenly over the top and sides. Use it all for maximum flavor.
Bake: Cook for 10–14 minutes, depending on thickness. Start checking at 10 minutes.
The salmon should flake easily and look slightly translucent in the center.
Optional broil: For extra caramelization, switch to broil for 1–2 minutes at the end. Watch closely to prevent burning.
Rest and garnish: Let sit for 2–3 minutes. Spoon any pan juices over the fillets.
Top with chopped parsley or chives and serve with lemon wedges.