01 - Preheat the oven to 400°F. Prepare a baking dish by lining it with parchment paper or lightly greasing with olive oil.
02 - Place the fish fillets in a single layer within the prepared baking dish.
03 - In a small bowl, whisk together olive oil, lemon juice, minced garlic, salt, pepper, and dried oregano or thyme.
04 - Evenly drizzle the marinade over the fish fillets.
05 - Layer the thin lemon slices atop each fillet, covering them evenly.
06 - Bake for 15 to 18 minutes until the fish becomes opaque and flakes easily with a fork.
07 - Remove from the oven, sprinkle with fresh chopped parsley, and serve immediately with optional lemon wedges.