Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Trim the tough, woody ends off the asparagus and spread the spears in a single layer on one side of the prepared baking sheet.
Drizzle the asparagus with the extra virgin olive oil and season with half of the 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.
Spread the Dijon mustard evenly over the top surface of the salmon to act as a binder for the crust.
In a small bowl, whisk together the almond flour, garlic powder, dried parsley, and the remaining salt and pepper.
Press the almond mixture firmly onto the mustard-coated salmon to create an even, golden layer.
Roast for 12 to 15 minutes, depending on the thickness of the fillet, until the salmon is opaque and the crust is lightly toasted.
Remove from the oven and finish with a bright squeeze of fresh lemon juice over both the salmon and the asparagus before serving.