01 - Preheat oven to 400°F. Line a baking dish with parchment paper or lightly grease it.
02 - Pat fish fillets dry with paper towels. Season both sides evenly with salt and black pepper.
03 - Place fillets in a single layer within the prepared baking dish.
04 - In a small bowl, mix melted butter, lemon juice, lemon zest, minced garlic, chopped parsley, and paprika if desired.
05 - Pour the lemon butter sauce evenly over fillets. Top each with a lemon slice.
06 - Bake for 15 to 20 minutes until fish is opaque and flakes easily with a fork.
07 - Remove from oven, garnish with extra parsley, and serve immediately.