Preheat your oven to 425°F. Line a baking sheet with parchment paper.
Cube the half medium sweet potato into bite-sized pieces and toss with half the olive oil, a pinch of salt, and a pinch of black pepper.
Spread the sweet potato cubes on the prepared baking sheet and roast in the oven for 20-25 minutes until tender and slightly caramelized, stirring halfway through.
While the sweet potatoes roast, pat the salmon fillet dry with paper towels.
Season the salmon on both sides with salt, black pepper, and garlic powder.
Heat the remaining olive oil in a non-stick skillet over medium-high heat.
Place the salmon skin-side down in the hot skillet and press lightly to ensure even contact; cook for 3-4 minutes until the skin becomes crispy.
Flip the salmon carefully and cook for an additional 2-3 minutes until the salmon is just cooked through.
Plate the salmon alongside the roasted sweet potatoes.
Garnish with a fresh rosemary sprig and squeeze the lemon wedge over the top before serving.