01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it with oil.
02 - In a small mixing bowl, whisk together the maple syrup, Dijon mustard, olive oil, lemon juice, salt, and pepper until smooth and well combined.
03 - In a separate bowl, combine the chopped pistachios, panko breadcrumbs, lemon zest, and parsley. Toss gently to distribute the ingredients evenly.
04 - Pat the salmon fillets thoroughly dry with paper towels and arrange them on the prepared baking sheet, spacing them at least 1 inch apart.
05 - Using a pastry brush, generously coat the top and sides of each salmon fillet with the maple-mustard glaze, reserving a small amount for basting if desired.
06 - Gently press the pistachio mixture onto the glazed surface of each fillet, forming an even, cohesive crust that adheres well to the fish.
07 - Bake on the center rack for 15 to 20 minutes, until the salmon is opaque throughout and flakes easily with a fork, and the pistachio crust is golden brown.
08 - Remove from the oven and let rest for 2 minutes. Serve immediately alongside roasted vegetables, quinoa, or a fresh green salad.