Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it.

In a small bowl, whisk together brown sugar, soy sauce, Dijon mustard, olive oil, minced garlic, and black pepper until smooth.

Place the salmon fillets on the prepared baking sheet. Spoon the glaze evenly over the tops of the fillets.

Bake the salmon for 12–15 minutes, depending on thickness, until it flakes easily and glaze is bubbling.

Serve immediately with your choice of sides, and spoon any extra glaze over the top.