01 - Preheat the oven to 400°F (200°C). Line a baking dish with parchment paper or lightly grease it with olive oil.
02 - Place the fish fillets in a single layer in the prepared baking dish.
03 - In a small bowl, whisk together olive oil, lemon juice, minced garlic, salt, black pepper, and dried oregano or thyme.
04 - Drizzle the marinade evenly over the fish fillets.
05 - Place thin lemon slices on top of each fillet, covering them evenly.
06 - Bake in the preheated oven for 15 to 18 minutes, until the fish is opaque and flakes easily with a fork.
07 - Remove from oven, sprinkle with chopped fresh parsley, and serve immediately with optional lemon wedges.