Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Trim the tough, woody ends off the asparagus spears and spread them out on one side of the baking sheet.
Drizzle the asparagus with olive oil and toss with a pinch of the sea salt and black pepper to coat evenly.
Pat the salmon fillet dry with a paper towel and place it on the other side of the baking sheet.
Spread the Dijon mustard in a thin, even layer over the top of the salmon fillet.
In a small bowl, whisk together the almond flour, dried parsley, garlic powder, and the remaining salt and pepper.
Carefully press the almond flour mixture onto the mustard-coated salmon to create an even crust.
Place the baking sheet in the oven and roast for 12-15 minutes, or until the salmon is flaky and the asparagus is crisp-tender.
Remove from the oven and finish with a fresh squeeze of lemon juice over the salmon and asparagus before serving.