01 - Set the oven to 400°F (200°C) and prepare a baking sheet by lining it with parchment paper or lightly greasing it.
02 - Combine olive oil, lemon juice, minced garlic, sea salt, black pepper, paprika, and parsley in a small bowl and mix well.
03 - Pat cod fillets dry using paper towels and place them evenly on the prepared baking sheet.
04 - Brush each fillet thoroughly with the marinade, coating both sides to enhance flavor.
05 - Place lemon slices atop the cod fillets to impart a fresh citrus aroma 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 the baking sheet from the oven, garnish with chopped fresh parsley as desired, and serve immediately.