Preheat your oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper.
Trim the woody ends off the asparagus and place the spears on the baking sheet.
Drizzle the asparagus with 0.5 tbsp of olive oil and season with half of the salt and pepper.
Roast the asparagus in the oven for 12-15 minutes until 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, pepper, and garlic powder.
Heat the remaining 0.5 tbsp of olive oil in a cast-iron or stainless steel skillet over medium-high heat until shimmering.
Place the salmon in the skillet skin-side down and press gently with a spatula for 10 seconds to ensure even contact.
Sear the salmon for 4-5 minutes until the skin is crispy and golden, then carefully flip and cook for another 2-3 minutes until the center is just opaque.
Remove the salmon and asparagus from heat and serve immediately with a fresh squeeze of lemon juice over the top.