Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Toss the cubed sweet potatoes with 0.5 tsp of olive oil, half of the sea salt, and half of the black pepper.
Spread the sweet potatoes on the baking sheet and roast for 20 minutes until the edges are golden and the centers are tender.
While potatoes roast, season the salmon fillet evenly with the remaining sea salt, black pepper, and the garlic powder.
Heat the remaining 0.5 tsp of olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan skin-side up and sear for 4 to 5 minutes per side until the exterior is crispy and the fish flakes easily with a fork.
Remove the salmon from the pan and set aside; immediately add the fresh spinach to the hot pan and sauté for 1 minute until just wilted.
In a small saucepan, gently warm the tomato sauce over low heat until simmering.
To serve, place the roasted sweet potatoes and wilted spinach on a plate, top with the pan-seared salmon, and drizzle with the warm tomato sauce and fresh parsley.