Preheat your oven to 400°F (200°C). Line a baking tray with parchment paper or lightly grease it with oil.
Make the glaze
In a small bowl, combine Dijon mustard, maple syrup, minced garlic, black pepper, salt, and olive oil. Mix until smooth.
Prepare the salmon
Place the salmon fillets skin-side down on the baking tray. Pat dry with a paper towel to help the glaze stick.
Glaze the salmon
Spoon the maple-mustard mixture evenly over each fillet, spreading it gently across the top.
Bake
Bake for 12 to 15 minutes, depending on thickness, until the salmon flakes easily with a fork.
Optional broil
For a lightly caramelized top, broil for the final 1 to 2 minutes. Watch closely to avoid burning.
Serve
Remove from the oven and rest for 2 minutes. Serve warm with roasted Brussels sprouts or quinoa.