Step 1: Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup of your baked salmon with lemon butter sauce.
Step 2: Pat the salmon fillets dry with paper towels to ensure a good sear. Place them on the prepared baking sheet.
Step 3: Drizzle the salmon with olive oil and season evenly with salt, pepper, and garlic powder, pressing the spices gently into the flesh.
Step 4: Bake the salmon for 12-15 minutes, depending on the thickness, until it is opaque and flakes easily with a fork.
Step 5: While the fish is baking, melt the butter in a small saucepan over medium-low heat. Be careful not to let it brown.
Step 6: Stir in the fresh lemon juice and lemon zest. Whisk constantly for 1-2 minutes until the sauce is slightly thickened and emulsified.
Step 7: Remove the salmon from the oven and immediately pour the lemon butter sauce over each fillet. Garnish with fresh parsley and extra lemon slices.
Step 8: Serve your baked salmon with lemon butter sauce immediately while hot for the best flavor and texture.