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 with salt and pepper.
03 - Arrange salmon fillets, skin-side down, on the prepared baking sheet.
04 - In a small bowl, whisk together melted butter, garlic, lemon juice, lemon zest, olive oil, and chopped parsley.
05 - Drizzle the lemon garlic butter sauce evenly over the salmon fillets.
06 - Top each fillet with a lemon slice, if desired.
07 - Bake for 12–15 minutes, or until salmon flakes easily with a fork and is just cooked through.
08 - Remove from oven, garnish with additional parsley, and serve immediately.