01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it with oil.
02 - In a small 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 (if using), lemon zest, and parsley. Toss to distribute evenly.
04 - Pat the salmon fillets 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 of each salmon fillet with the maple-mustard glaze, reserving a small amount for basting if desired.
06 - Firmly press the pistachio mixture onto the glazed surface of each fillet, building an even, cohesive crust across the top.
07 - Bake for 15 to 20 minutes, until the salmon is opaque throughout, flakes easily with a fork, and the pistachio crust is golden brown.
08 - Remove from the oven and serve immediately alongside roasted vegetables, quinoa, or a fresh green salad.