01 - Set the oven to 400°F and prepare a baking sheet by lining it with parchment paper or greasing lightly.
02 - Combine olive oil, lemon juice, minced garlic, sea salt, black pepper, paprika, and parsley in a small bowl and mix well.
03 - Pat the cod fillets dry using paper towels and arrange them evenly on the baking sheet.
04 - Brush the marinade generously over both sides of each fillet to ensure full coverage.
05 - Place lemon slices atop each fillet for added flavor.
06 - Bake in the preheated oven for 15 to 18 minutes until the fish is opaque and flakes easily with a fork.
07 - Remove from oven, optionally garnish with fresh parsley, and serve immediately.