Preheat your oven to 400°F (200°C).
Line a baking sheet with parchment paper.
In a medium mixing bowl, whisk together the Dijon mustard, melted butter, honey, ½ teaspoon of salt, and black pepper.
Place the salmon fillets skin-side down on the prepared baking sheet. Coat each fillet with the honey mustard mixture.
In another bowl, combine the panko breadcrumbs, finely chopped pecans, parsley (if using), and the remaining ½ teaspoon of salt. Mix well.
Sprinkle the pecan-panko mixture over the glazed salmon fillets, pressing it down gently.
Bake for 12-15 minutes, or until the salmon is cooked through and flakes easily with a fork.
Let it rest for a few minutes, squeeze fresh lemon juice on top if desired, and serve.