01 - Preheat oven to 400°F. Line a baking dish with parchment paper or lightly grease it.
02 - Pat cod fillets dry with paper towels and arrange them in the prepared baking dish.
03 - Whisk olive oil, lemon juice, minced garlic, dried oregano, dried thyme, salt, and black pepper in a small bowl until combined.
04 - Brush or spoon the marinade evenly over the cod fillets.
05 - Place lemon slices on and around the cod fillets in the baking dish.
06 - Bake for 15 to 18 minutes until the fish flakes easily with a fork and is opaque throughout.
07 - Remove from oven, sprinkle with fresh parsley, and serve immediately.