Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper or foil.
Season the salmon with salt and pepper. Place fillets skin-side down on the baking sheet.
Mix Parmesan, almonds, breadcrumbs (if using), and parsley in a bowl.
In another bowl, stir melted butter and Dijon mustard together.
Brush the top of each fillet with the mustard mixture.
Press the cheese-almond mix onto each fillet, covering the top evenly.
Bake for 12–15 minutes, or until the crust is golden and salmon flakes easily with a fork.
Serve hot with lemon wedges on the side.