Preheat your oven to 425°F (220°C).
Peel and dice the sweet potato into even cubes. Toss with a pinch of salt, pepper, and a drizzle of olive oil.
Spread the sweet potato cubes on a baking tray and roast in the oven for 20-25 minutes until tender.
Meanwhile, trim the tough ends off the asparagus, and place them on a separate baking tray. Drizzle with a small amount of olive oil, sprinkle salt and pepper, and roast in the oven for 12-15 minutes until tender-crisp.
Season the salmon fillet on both sides with salt, pepper, and garlic powder. Heat a non-stick skillet over medium-high heat.
Once the skillet is hot, add the salmon skin-side down (if applicable) and sear for about 3-4 minutes per side, depending on thickness, until a golden crust forms and the salmon is cooked to your liking.
While the salmon cooks, transfer the roasted sweet potato to a bowl and mash until smooth. Season further with salt and pepper if needed.
Plate by spreading a layer of sweet potato mash, arranging the seared salmon fillet on top, and side laying the roasted asparagus. Top the sweet potato mash with a dollop of nonfat Greek yogurt for a creamy finish.
Serve immediately and enjoy your balanced, nutrient-rich dinner.