Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.
Pat salmon fillets dry with paper towels. Season with salt and pepper.
In a small bowl, mix Dijon mustard, maple syrup, and minced garlic until smooth.
In another bowl, combine chopped pistachios, panko, and melted butter. Stir well.
Brush glaze evenly over the top of each salmon fillet.
Press the pistachio mixture gently onto the glazed surface.
Place salmon on prepared baking sheet. Bake for 12–15 minutes or until internal temperature reaches 145°F.
Rest for 5 minutes before serving. Optional broil for 1–2 minutes for extra crisp crust.