Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and cube the sweet potato into 1/2-inch pieces, then toss them with half of the olive oil, salt, and garlic powder.
Spread the sweet potatoes on the baking sheet and roast for 15 minutes.
Trim the woody ends off the asparagus and toss the spears with the remaining olive oil and a pinch of salt.
Move the potatoes to one side of the tray, add the asparagus to the other side, and roast for another 10-12 minutes until the potatoes are golden and the asparagus is tender.
While the vegetables finish roasting, season the salmon fillet with salt and pepper.
Heat a non-stick skillet over medium-high heat and place the salmon in the pan, skin-side down, searing for 4-5 minutes until the skin is crispy.
Carefully flip the salmon and cook for an additional 2-3 minutes until the fish is just opaque and flakes easily.
Plate the seared salmon alongside the roasted sweet potatoes and asparagus, then finish with a fresh squeeze of lemon juice over the entire dish.