Preheat the oven: Set to 400°F (200°C).
Line a baking sheet with parchment or lightly grease a baking dish that fits the cod in a single layer.
Prep the lemon and garlic: Zest the lemon first, then juice it. Mince the garlic finely to prevent any harsh bites.
Make the quick marinade: In a small bowl, whisk together 1 tablespoon olive oil, 2 tablespoons lemon juice, all the lemon zest, minced garlic, 1/4 teaspoon salt, and a few grinds of black pepper. If you like a soft heat, add a pinch of red pepper flakes.
Season the cod: Pat the fillets dry with paper towels.
This helps browning and keeps the texture tight. Sprinkle both sides lightly with salt and pepper.
Arrange and add liquid: Place the cod in the dish. Pour the marinade evenly over the top.
Add the 1/4 cup broth to the pan around the fish, not on top. This creates gentle steam that keeps the cod moist and low in fat.
Bake: Transfer to the oven and bake for 10–12 minutes, depending on thickness. Cod is done when it flakes easily with a fork and turns opaque throughout. Thicker pieces may need up to 14 minutes.
Optional quick broil: For a light golden top, switch to broil for 1–2 minutes.
Keep a close eye to avoid overcooking.
Finish with freshness: Sprinkle chopped parsley over the fillets. Taste the pan juices; if you want more brightness, add an extra squeeze of lemon. Drizzle with up to 1 more teaspoon olive oil if desired.
Serve: Spoon the lemon-garlic pan sauce over the fish.
Pair with steamed green beans, roasted asparagus, or a simple salad. For a heartier plate, add quinoa or roasted potatoes.