Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into half-inch cubes, then toss them on the baking sheet with 1 teaspoon of olive oil, garlic powder, and a pinch of sea salt.
Roast the sweet potatoes for 15 minutes.
Move the potatoes to one side of the tray and add the trimmed asparagus spears to the other side, drizzling them with a tiny amount of the remaining oil if needed.
Continue roasting the vegetables for another 8-10 minutes until the potatoes are tender and the asparagus is bright green.
While vegetables roast, pat the salmon fillet dry with a paper towel and season both sides with the remaining sea salt and black pepper.
Heat the remaining teaspoon of olive oil in a non-stick or cast-iron skillet over medium-high heat.
Place the salmon in the pan skin-side up and sear for 4-5 minutes until a golden-brown crust forms, then flip and cook for an additional 3 minutes until just cooked through.
Plate the salmon with the roasted vegetables and finish with a bright squeeze of fresh lemon juice.