Baked cod is the weeknight dinner that’s already doing everything right: virtually zero carbs, 22g of lean protein, and ready in 25 minutes with almost no technique required. This version adds a lemon-herb butter — softened butter mixed with garlic, fresh parsley, and dill — that melts over the hot fish, turning it into something that tastes far more restaurant-quality than the effort deserves.
The only technique that matters: pat the fish dry, preheat the oven, and don’t overbake. Cod goes from perfectly flaky to dry and rubbery quickly. Ten minutes in a 400°F oven is usually all it needs.
⏱️ Quick Stats
✓ Low-Carb
✓ Diabetic-Friendly
✓ Gluten-Free
✓ Pescatarian
🥑 Why This Baked Cod Works for Keto
Essentially zero net carbs: Cod is a lean white fish with virtually no carbohydrates — the 1g net carb in this recipe comes entirely from the small amount of lemon juice and garlic in the compound butter. At 180 calories and 1g net carb, this is one of the cleanest keto proteins available.
22g of lean, high-quality protein: Cod provides all essential amino acids in a low-fat package. The protein-to-calorie ratio here — 22g protein for 180 calories — is exceptional, and that protein load supports blood sugar stability and keeps you full well past dinner.
Omega-3 fatty acids: White fish like cod contains omega-3 fatty acids associated with reduced inflammation and cardiovascular support. For anyone managing blood sugar long-term, heart health and glucose management are closely linked — this dish supports both.
Herb butter adds fat, not carbs: The lemon herb butter contributes the healthy fats that round out the keto macros without adding meaningful carbohydrates. Butter’s fat content slows digestion and helps fat-soluble vitamins from the herbs absorb properly.
No breadcrumbs, no starch, no sugar: Many baked cod recipes rely on panko breadcrumb coatings or sweet glazes that add 10–20g of carbs per serving. This version has none — the flavor comes entirely from the herb butter and the fish itself. For another zero-carb seafood approach, our Steamed Fish with Ginger uses the same clean principle with a Chinese flavor profile.
Baked Cod vs. Breaded Fish
| Factor | Breaded / Fried Cod | This Recipe | Difference |
|---|---|---|---|
| Net Carbs | 18–25g | 1g | ~95% less |
| Calories | 320–450 | 180 | ~50% less |
| Protein | 18–20g | 22g | More protein |
| Added Sugar | 2–5g (glaze) | 0g | None added |
| Keto-Friendly? | ❌ No | ✅ Yes | — |
Here’s the full baked cod recipe — ingredients, steps, and herb butter variations in one card:
Baked Cod with Lemon Herb Butter | Keto, 1g Net Carb
Ingredients
Equipment
Method
- Preheat oven to 400°F (200°C). Lightly grease a baking dish with olive oil or cooking spray.
- Make the lemon herb butter: In a small bowl, mash together the softened butter, minced garlic, lemon juice, lemon zest, fresh parsley, dill, and salt with a fork until fully combined. Set aside. (This can be made up to 3 days ahead and refrigerated.)
- Pat the cod fillets completely dry with paper towels — this is essential for proper browning. Place in the prepared baking dish. If fillets vary in thickness, fold thin tail ends under to create uniform pieces. Drizzle with olive oil and season with salt and black pepper.
- Divide the herb butter evenly over the top of each fillet, spreading gently to cover.
- Bake for 10–15 minutes until the cod flakes easily with a fork at its thickest point and reaches an internal temperature of 145°F. Thin fillets (under ¾ inch) will be done at 10 minutes; thicker fillets need 12–15 minutes. Do not overbake — cod turns dry and rubbery quickly past 145°F.
- Remove from oven. Spoon any pan juices and melted herb butter back over the fillets. Garnish with extra fresh parsley and lemon wedges. Serve immediately.
Nutrition
Notes
Tried this recipe?
Let us know how it was!Chef’s Tips for Perfect Baked Cod
Dry the fillets — this is non-negotiable: Pat the cod completely dry with paper towels before seasoning. Surface moisture creates steam in the oven, preventing any browning and causing seasonings to slide off. Dry fish browns; wet fish steams. Thirty seconds with paper towels makes a meaningful difference.
Handle thickness variation: Cod fillets often vary significantly — thick in the middle, thin at the tail end. Fold thin tail ends under themselves to create a uniform thickness that cooks at the same rate. Otherwise the thin ends overcook before the thick center is done.
Don’t overbake: Cod goes from perfectly flaky to dry and rubbery within minutes. Start checking at 10 minutes. The fish is done when it flakes easily with a fork at its thickest point and reaches 145°F internally. Pull it the moment it gets there.
Butter must be softened, not melted: Room temperature butter mashes together with herbs into a proper compound — melted butter just runs off and separates. If you’re in a hurry, cut butter into small pieces and microwave for 5-second intervals until just soft.
Make the butter ahead: The herb butter keeps for up to 3 days refrigerated or 3 months frozen. Make a double batch, roll it into a log in parchment paper, and slice off coins for future fish, chicken, or vegetables. It’s the most versatile 5-minute prep you can do.
Herb variations: Parsley and dill is the classic combination. Tarragon and chives gives a French profile. Basil and lemon zest leans Italian. Cilantro and lime moves it toward a Baja direction. The technique is identical regardless of which herbs you use.
📦 Storage and Serving Suggestions
Refrigerator Storage: Store leftover baked cod in an airtight container for up to 2 days. Fish is always best fresh, but it reheats reasonably well in a 275°F oven for about 10 minutes covered with foil — the low temperature prevents it drying out. Cold leftover cod flaked over a salad is an excellent no-heat lunch option.
Herb Butter Storage: The compound butter stores separately for up to 5 days in the fridge or 3 months frozen. Roll into a parchment log and slice off portions as needed.
Serving Suggestions: This baked cod pairs naturally with low-carb vegetables — roasted asparagus, sautéed spinach with garlic, steamed broccoli, or a crisp arugula salad with olive oil and lemon. For a complete Mediterranean-inspired meal, serve alongside the Mediterranean diet lunch ideas collection for sides that keep the carbs in check. For another quick keto seafood option, the Air Fryer Salmon Bowls use the same light, protein-forward approach in a different format.
Meal Prep: The herb butter can be made 3 days ahead. Portion the dry-seasoned fish on a lined baking sheet and refrigerate — when ready to cook, add the butter and bake. Active cook time is 15 minutes from a cold fridge start.
How long do you bake cod?
At 400°F, cod fillets typically bake in 10–15 minutes, depending on thickness. A 1-inch-thick fillet needs about 12-15 minutes; thinner fillets (under ¾ inch) are often done in 10 minutes. The fish is ready when it flakes easily at its thickest point with a fork and reaches an internal temperature of 145°F. Check early — overcooked cod turns dry and rubbery quickly.
Is baked cod keto-friendly?
Yes, cod is one of the most keto-friendly proteins available. It contains virtually zero carbohydrates and delivers 22g of lean protein per serving. This baked cod recipe has just 1g net carb per serving, coming entirely from the lemon juice and garlic in the herb butter. There are no breadcrumbs, starches, or added sugars.
Can I use frozen cod for this recipe?
Yes, but thaw it completely first and pat it thoroughly dry before seasoning. Frozen cod releases significantly more water than fresh, which creates steam in the oven and prevents proper browning. Thaw overnight in the refrigerator, then pat dry with paper towels immediately before baking. The result will be nearly identical to fresh cod.
What can I substitute for cod?
Any firm white fish works with this recipe, and the same timing applies for similar thickness: halibut, tilapia, haddock, sea bass, or mahi-mahi all work well. Thinner fish, like tilapia, may need 2-3 minutes less cooking time. Salmon also works beautifully with the lemon herb butter — it needs slightly longer (15-18 minutes) and benefits from the same technique.
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Baked cod is genuinely one of the easiest high-protein keto meals you can make — flaky white fish, a five-minute herb butter, and a hot oven. At 1g net carb and 22g protein, it fits every low-carb framework without any adaptation. The only thing that separates good baked cod from great is drying the fish properly and pulling it from the oven before it goes too far.
Medical Disclaimer: The nutritional information provided in this article is for informational purposes only. While we strive for accuracy, individual responses to foods vary. Always consult with your healthcare provider or registered dietitian about dietary changes, especially if you’re managing diabetes or other health conditions.
