Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Trim the tough, woody ends off the asparagus spears and place them on the prepared baking sheet.
Drizzle the asparagus with half of the olive oil and season with garlic powder, half of the salt, and half of the pepper, tossing to coat evenly.
Roast the asparagus in the oven for 12 to 15 minutes until they are tender and slightly charred at the tips.
While the asparagus roasts, pat the salmon fillet completely dry with a paper towel and season both sides with the remaining salt and pepper.
Heat the remaining olive oil in a medium skillet over medium-high heat until shimmering but not smoking.
Place the salmon skin-side down in the hot skillet and sear for 4 to 5 minutes without moving it to ensure the skin becomes perfectly crispy.
Carefully flip the salmon and cook for another 2 to 3 minutes until the fish is opaque and flakes easily with a fork.
Plate the salmon alongside the roasted asparagus and finish with a bright squeeze of fresh lemon juice over everything.