Rinse the quinoa under cold water, then combine with 0.5 cup water in a small saucepan and bring to a boil.
Reduce heat to low, cover, and simmer for 12-15 minutes until the water is absorbed and quinoa is fluffy.
Pat the salmon fillet dry with paper towels and season both sides with sea salt, black pepper, and garlic powder.
Heat the olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan, skin-side down, and sear for 4-5 minutes until the skin is golden and very crisp.
Carefully flip the salmon and cook for an additional 2-3 minutes until the fish is opaque and flakes easily.
In a bowl, toss the cooked quinoa with lemon juice, lemon zest, chopped parsley, and fresh baby spinach while the quinoa is still hot to wilt the greens.
Plate the lemon-herb quinoa and top with the pan-seared salmon fillet.