01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease a baking dish.
02 - Pat salmon fillets dry with paper towels. Season both sides generously with salt and pepper.
03 - Place salmon fillets on the prepared baking sheet, skin-side down.
04 - In a small bowl, whisk together melted butter, minced garlic, lemon juice, lemon zest, olive oil, and chopped parsley until well combined.
05 - Drizzle the lemon garlic butter mixture evenly over each salmon fillet.
06 - Place a lemon slice on top of each fillet if desired.
07 - Bake for 12–15 minutes until salmon flakes easily with a fork and is just cooked through.
08 - Remove from oven, sprinkle with additional fresh parsley, and serve immediately.