Preheat your oven to 400°F (200°C).
Prepare a baking dish by coating it with a tablespoon of olive oil.
Place the salmon fillets in the prepared baking dish, skin-side down.
Drizzle the remaining olive oil over the salmon and season with garlic powder, salt, and pepper.
Sprinkle the crumbled feta cheese evenly over the salmon fillets.
Squeeze fresh lemon juice over the salmon and feta.
Bake the salmon in the preheated oven for 12-15 minutes, or until it flakes easily with a fork.
While the salmon is baking, prepare the avocado by slicing it in half, removing the pit, and cutting it into cubes.
Once done, remove the salmon from the oven and let it rest for a few minutes.
Top the salmon with the diced avocado and sprinkle with fresh parsley before serving.