01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it with cooking spray.
02 - Pat salmon fillets dry with paper towels. Place fillets skin-side down on the prepared baking sheet. Season lightly with salt and pepper.
03 - In a small bowl, combine maple syrup, whole-grain mustard, and lemon juice. Brush the mixture generously over the top of each fillet using a pastry brush.
04 - In another bowl, mix the chopped pistachios and thyme. Press the mixture evenly onto the glazed surface of each fillet, gently pressing so the crust adheres firmly.
05 - Bake for 14–18 minutes, or until the salmon flakes easily with a fork and the pistachio crust turns golden brown. Adjust cooking time based on fillet thickness.
06 - Remove from the oven and let the salmon rest for 2 minutes. Serve with lemon wedges and a sprinkle of fresh dill or parsley if desired.