Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the cubed sweet potatoes with half of the avocado oil and a pinch of sea salt, then spread them in a single layer on the baking sheet.
Roast the sweet potatoes for 15 minutes.
Remove the tray from the oven, add the asparagus spears, drizzle with a tiny bit of water or additional oil spray if needed, and roast for another 10 minutes until the vegetables are tender.
While the vegetables roast, pat the salmon fillet dry with a paper towel and season both sides with salt and pepper.
Heat the remaining avocado oil in a non-stick skillet over medium-high heat.
Place the salmon in the hot skillet, skin-side down, and sear for 4-5 minutes until the skin is golden and crisp.
Carefully flip the salmon and cook for another 2-3 minutes until the fish is just opaque and flakes easily with a fork.
Plate the seared salmon alongside the roasted sweet potatoes and asparagus, finishing the dish with a fresh squeeze of lemon juice.