Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into uniform 1/2-inch cubes to ensure even roasting.
In a medium bowl, toss the sweet potato cubes with 0.5 tsp of olive oil and half of the sea salt, black pepper, and garlic powder.
Spread the sweet potatoes on the prepared baking sheet and roast for 20-25 minutes until the edges are golden and crispy.
While the potatoes roast, trim the woody ends off the asparagus spears and set them aside.
Pat the salmon fillet completely dry with a paper towel and season both sides with the remaining sea salt, black pepper, and garlic powder.
Heat the remaining 0.5 tsp of olive oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon in the pan skin-side down and sear for 4-5 minutes until the skin is crisp and releases easily from the pan.
Carefully flip the salmon fillet and cook for another 3-4 minutes until the flesh is opaque and flakes easily with a fork.
During the final 5 minutes of cooking, steam the asparagus in a small pot with a splash of water until bright green and tender-crisp.
Arrange the salmon on a plate with the roasted sweet potatoes and asparagus, then finish with a bright squeeze of fresh lemon juice.