01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease a baking dish.
02 - Place salmon fillets on the baking sheet with the skin-side down if applicable.
03 - In a small bowl, mix melted butter, minced garlic, lemon juice, lemon zest, chopped parsley, salt, and black pepper until combined.
04 - Generously spoon the butter mixture over each salmon fillet, ensuring even coverage.
05 - Place lemon slices atop each fillet as desired.
06 - Bake in the preheated oven for 12 to 15 minutes until the salmon flakes easily with a fork and is opaque in the center (internal temperature 145°F).
07 - Remove from oven, garnish with additional parsley and lemon slices, and serve immediately.