01 - Set oven temperature to 400°F and prepare a baking sheet using parchment paper or lightly grease it.
02 - Combine olive oil, lemon juice, minced garlic, sea salt, black pepper, paprika, and parsley in a small bowl.
03 - Pat cod fillets dry with paper towels and place them evenly on the prepared baking sheet.
04 - Brush each fillet thoroughly with the marinade on both sides to ensure even coating.
05 - Place lemon slices on top of each fillet to infuse flavor during baking.
06 - Bake in the preheated oven for 15 to 18 minutes until the fish turns opaque and flakes easily with a fork.
07 - Remove from oven, optionally sprinkle with fresh parsley, and serve immediately.