01 - Set oven to 400°F and line a baking dish with parchment paper or lightly grease it.
02 - Pat fillets dry and season both sides evenly with salt and black pepper.
03 - Place the seasoned fillets in a single layer within the prepared baking dish.
04 - In a small bowl, blend melted butter, lemon juice, lemon zest, minced garlic, chopped parsley, and optional paprika until combined.
05 - Evenly pour the lemon butter mixture over each fish fillet.
06 - Top each fillet with a lemon slice for added flavor and presentation.
07 - Bake in the preheated oven for 15 to 20 minutes or until the fish is opaque and flakes easily with a fork.
08 - Remove from oven, garnish with additional parsley, and serve immediately.