01 - Preheat the oven to 400°F. Line a baking sheet with 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 the cod fillets dry with paper towels and place them evenly on the prepared baking sheet.
04 - Brush the marinade liberally on both sides of each fillet to ensure even seasoning.
05 - Place lemon slices evenly atop each fillet for added aroma and flavor during baking.
06 - Bake for 15 to 18 minutes until the fish turns opaque and flakes easily when tested with a fork.
07 - Remove from oven, garnish with fresh parsley if desired, and serve immediately.