01 - Set the oven to 400°F and line a baking sheet with parchment paper or lightly grease a baking dish.
02 - Pat the fillets dry with paper towels and arrange them in a single layer on the prepared baking surface.
03 - In a small bowl, whisk together olive oil, lemon juice, lemon zest, minced garlic, salt, and black pepper until well blended.
04 - Brush the marinade evenly onto each fish fillet to ensure full coverage.
05 - Place thin lemon slices atop each marinated fillet for added flavor and presentation.
06 - Cook in the preheated oven for 18 to 20 minutes, or until the fish flakes easily with a fork and is opaque throughout.
07 - Remove from oven and sprinkle chopped parsley over the fillets before serving.