Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Trim the woody ends off the asparagus and place them on one side of the baking sheet, tossing with half the olive oil, sea salt, and black pepper.
Pat the salmon fillet dry with a paper towel and place it on the other side of the baking sheet.
In a small bowl, whisk together the Dijon mustard, almond flour, dried parsley, garlic powder, and lemon zest until a thick paste forms.
Spread the almond-herb mixture evenly over the top of the salmon fillet, pressing down slightly so it adheres.
Drizzle the remaining olive oil over the asparagus and salmon crust.
Roast for 12 to 15 minutes, depending on the thickness of the fillet, until the salmon flakes easily with a fork and the asparagus is tender and lightly charred.
Remove from the oven and let the salmon rest for 2 minutes before serving.