Frozen Cod Recipes: Easy Lemon Garlic Cod From Frozen

This baked lemon garlic cod is a simple way to turn frozen cod fillets into a flaky, savory dinner without thawing them first. A quick butter, lemon, and garlic topping goes on after the fish begins to soften in the oven, so it clings better and the fillets cook evenly.

Ingredients

4 frozen cod fillets, 5–6 oz (140–170 g) each, about 20–24 oz (570–680 g) total
2 tbsp unsalted butter, melted (28 g)
1 tbsp olive oil (15 ml)
1 tbsp fresh lemon juice (15 ml)
1 tsp finely grated lemon zest (about 2 g)
2 garlic cloves, finely minced (about 6 g)
½ tsp paprika (about 1 g)
½ tsp kosher salt (about 3 g; use a little less if using fine table salt)
¼ tsp black pepper (about 0.5 g)
1 tbsp chopped fresh parsley (about 4 g), optional
4 lemon wedges, for serving

Use individually frozen fillets that can be arranged in one layer, rather than a solid block of fish. If your cod is packaged with a thick ice glaze, you can let that melt during the first bake and carefully pour off the liquid before adding the topping.

Instructions

Heat the oven and prepare the pan. Set a rack in the middle of the oven and heat it to 425°F (220°C). Line a rimmed baking sheet with parchment paper or foil. Leave space between the fillets so hot air can circulate around them.
Start baking the frozen cod. Place the frozen fillets on the lined pan, leaving any small pieces of loose ice behind. Bake for 10 minutes. The surface should begin to soften, and some liquid may collect on the pan. If fillets were frozen together, gently separate them only once the edges have softened; do not pull hard enough to break the fish.
Mix the lemon garlic topping. While the fish starts baking, stir together the melted butter, olive oil, lemon juice, lemon zest, minced garlic, paprika, salt, and pepper in a small bowl. Mixing the oil with butter helps the topping brush over the fillets easily, while the lemon keeps its flavor bright.
Drain and season. Carefully remove the pan from the oven. If there is a noticeable pool of liquid, tilt the pan and pour it off into the sink, taking care not to let the fish slide. Brush or spoon the butter mixture over the tops and sides of the fillets. Return the pan to the oven.
Bake until just cooked through. Bake for another 15–20 minutes, depending on the thickness and size of the fillets. Check the thickest part of each piece with an instant-read food thermometer: the USDA FSIS safe minimum internal temperature for fish is 145°F (63°C). The flesh should look opaque and separate into moist flakes when gently pressed with a fork. If a fillet has not reached the temperature, return it to the oven and check again after a few minutes.
Finish and serve. Sprinkle with parsley, if using, and serve straight away with lemon wedges. The fillets are delicate, so lift them from the pan with a thin spatula rather than trying to turn them over.

Tips

Check thickness, not just the clock. Frozen fillets vary considerably. Thin portions may be ready near the early end of the range, while thick center-cut pieces can need longer. Measure the thickest part of each fillet, and return only the under-temperature portions to the oven if they cook at different rates.
Keep the fish in a single layer. Crowding or overlapping the pieces traps steam and makes the centers cook less evenly. Use a second pan if necessary. If the fillets are frozen into one large block, separate them once they soften rather than trying to bake the block as-is.
Adjust the salt for your butter. The recipe uses unsalted butter, so you can control the seasoning. If you have salted butter, reduce the added salt and taste the finished topping before adding more.
Use dried herbs if fresh parsley is unavailable. Add ½ tsp (about 0.5 g) dried parsley to the butter mixture, or leave the herbs out. Dried parsley is less fresh-tasting, but the lemon and garlic still give the cod plenty of flavor.

Serving Suggestions

For an easy dinner, serve each fillet with roasted potatoes, rice, or buttered couscous to catch the lemony juices. Add a green vegetable such as broccoli, green beans, or asparagus; roast it on a separate pan while the cod cooks, or steam it near the end of the baking time. A crisp green salad with a mild vinaigrette is another good pairing, especially if the rest of the meal is rich.

If you want a more substantial plate, spoon the pan juices over the fish and a serving of rice, then add a wedge of lemon at the table. For tacos, break the cooked cod into large flakes and tuck it into warm tortillas with shredded cabbage, sliced avocado, and a spoonful of yogurt or sour cream. Keep any leftover fish separate from cold toppings so it can be stored and reheated safely.

Variations

Make it herby: Add 1 tsp (about 1 g) chopped fresh dill or thyme to the butter mixture. Dill gives the dish a classic pairing for mild fish; thyme adds a more savory, woodsy note. Use a smaller amount of dried herbs, since their flavor is more concentrated.

Add a little heat: Replace the paprika with ½ tsp (about 1 g) smoked paprika, or add a pinch of red pepper flakes. Smoked paprika brings a deeper, slightly smoky flavor, while chili flakes give a sharper heat. Start with less if serving people who prefer mild food.

Use a mustard topping: Stir 1 tsp (5 g) Dijon mustard into the butter mixture. It adds a gentle tang and helps the topping taste more rounded, without making the fish taste strongly of mustard.

Swap the citrus: Use lime juice and zest in place of lemon for a brighter, slightly different flavor. Orange zest can also be used with the lemon juice for a softer citrus aroma. Keep the total amount of juice close to the recipe quantity so the topping does not become too thin.

Storage and Reheating

Refrigerate cooked cod within 2 hours of cooking, in a covered container. Leftovers keep for 3–4 days in the refrigerator. For better texture, store the fillets whole and keep them separate from sides or toppings that release moisture. Cooked fish can also be frozen in an airtight freezer-safe container for up to 2 months; thaw it overnight in the refrigerator before reheating for the most even result.

Reheat gently in a covered baking dish at 300°F (150°C) until the center reaches 165°F (74°C), the recommended safe temperature for reheated leftovers. A tablespoon of water or broth in the dish can help limit drying. Check after about 10 minutes, then continue in short intervals as needed; timing depends on the thickness and whether the fish was chilled or thawed from frozen. A microwave also works: cover loosely and heat at medium power in short bursts, checking the center temperature. Avoid repeated reheating, which can make cod dry and crumbly.

Frequently Asked Questions

Can I bake cod straight from frozen?

Yes. This recipe is designed for frozen, individually portioned fillets, so thawing is not required. The initial 10-minute bake softens the surface before you add the topping. Frozen fillets often need more oven time than thawed ones, so use a food thermometer rather than relying only on appearance or a timer.

Should I thaw frozen cod before cooking it?

You can thaw cod overnight in the refrigerator if you prefer, but it is not necessary for this method. If using thawed fish, pat it dry and skip the initial 10-minute bake; add the topping and begin checking for doneness after about 10–12 minutes. The exact time varies with thickness, and the center still needs to reach 145°F (63°C).

Why is my baked cod watery?

Frozen fish can release water as it cooks, particularly if it has a heavy ice glaze or the fillets are crowded. Starting the fish on its own, then pouring off pooled liquid before adding the butter mixture, helps the topping stay flavorful. A rimmed pan prevents drips, and leaving space around each piece helps moisture evaporate instead of collecting between fillets.

How can I tell when cod is done without overcooking it?

Check the thickest part with an instant-read thermometer; fish is safely cooked at 145°F (63°C). At that point, cod should look opaque and flake easily, but it should still be moist. Begin checking near the shorter end of the baking range, especially if the fillets are thin. Cooking well past the safe temperature can make the fish dry.

Can I use another kind of fish?

Yes. Frozen haddock, pollock, or another mild white fish can work with the same lemon garlic topping. Fillets differ in thickness and texture, so start checking their temperature early and cook each piece to 145°F (63°C). Thicker pieces may need additional time; thinner pieces may be ready sooner.

Can I prepare the topping ahead?

You can mix the butter, oil, lemon, garlic, paprika, salt, and pepper up to a day ahead and keep it covered in the refrigerator. The butter will firm up, so warm the mixture gently until it is brushable, not hot, before using it. Do not spread the topping on frozen fillets and leave them sitting at room temperature; keep the fish frozen until you are ready to bake.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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