Do you love fish as much as I do? This Perfect Oven Baked Recipe For Cod Fillet In Shrimp and Mushroom Sauce is such a delicious way to serve up fish for dinner! The tender cod fillets, cooked to perfection, are baked in a light and extremely tasty sauce with chunks of tender shrimp and fresh mushrooms.
This cod fillet recipe has become a regular on our dinner rotation. The flavors of onion and garlic mixed with just a hint of lemon and parmesan cheese give it such a wonderful flavor! I was looking for a new way to serve baked fish, and this is it!
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🦐 Ingredients
- 1.5 pound of cod fillet. Cod has a mild flavor and dense, flaky, white meat. Cod is a good source of vitamin A, vitamin D, vitamin E, and omega-3 fatty acids (EPA and DHA), according to Wikipedia. Some good substitutes for cod are Haddock, Pollack, Tilapia, Black Cod, Striped Bass, Hake, Mahi Mahi, and Grouper.
- 2 tablespoon olive oil. I prefer organic olive oil, but feel free to use Avacado oil, coconut oil, or even butter or margarine.
- 1 cup of mushrooms, chopped. I prefer fresh mushrooms, but I also use canned mushrooms and dried mushrooms.
- ½ onion, chopped. I use red onions, but white, yellow, and green onions are great substitutes.
- 3 cloves of garlic, finely chopped. Again, I prefer fresh garlic. We grow it in our garden and have enough to last a year. If you don't have fresh, substitute ½ teaspoon of garlic powder for 3 cloves of fresh garlic, or 1.5 teaspoon of minced garlic.
- 1.5 cups of shrimp, peeled with tail removed, chopped. Shrimp is low in calories, does not contain carbs, and is high in protein, and contains 20 different vitamins and minerals.
- 3 tablespoon butter or margarine. Feel free to use olive oil, Avacado oil, or coconut oil.
- 3 tablespoon flour. I used whole wheat flour. You could also use all-purpose flour as well.
- ½ teaspoon salt. Use less salt if on a low-sodium diet.
- ⅛ teaspoon pepper.
- ½ teaspoon paprika. This spice has antioxidant properties, can help reduce the risk of cancer and heart disease, improve immunity, and even alleviate gas.
- 2 tablespoon parmesan cheese. Parmesan cheese is a good source of protein and fat. It's rich in vitamins and minerals like calcium, vitamin A, vitamins B6 and B12, phosphorus, zinc, and copper.
- 1.5 cup of milk. I used 1% milk. Alternatively, you could also use any kind of milk you prefer. Some good non-dairy options to try are coconut milk, soy milk, and almond milk.
- 2 tablespoon lemon juice (optional). This really gives it a distinct lemon flavor. HOWEVER, this may make your milk curdle, which happened to me. Not to worry though, it just requires an extra step. If it curdles, pour the sauce into a blender, carefully, and blend it up for 30 seconds. Pour it back into the pot.

🔪 Instructions
Preheat oven to 400 degrees Fahrenheit. Lightly grease a 9x13 baking dish. Place cod fillet in the baking dish. Sprinkle with salt and pepper on each fillet, to your taste. Use less salt if on a low-sodium diet. Then, bake, covered, for 15 minutes.
Next, we make the delicious sauce. In a large frying pan, saute 1.5 cups of shrimp with ½ onion and 3 cloves of garlic in 1 tablespoon of olive oil for about 5 minutes. Continue to cook until shrimp turns pink. Add 1 cup of sliced mushrooms to the shrimp mixture and sautee for 3-4 minutes.
In a separate pan, melt 3 tablespoon of butter or margarine over medium-low heat. Add in 3 tablespoon of flour. Whisk together until smooth. Add ½ teaspoon salt, ⅛ teaspoon pepper, ½ teaspoon paprika, and 2 tablespoon parmesan cheese to butter and milk mixture.
Whisking steadily, pour in 1.5 cups of milk. Continue to heat until the mixture begins to thicken.
If you would like a little bit of lemon flavor to your sauce, add 2 tablespoon of lemon juice. HOWEVER, this may make your milk curdle. If this happens, not to worry, just pour the sauce mixture into a blender and blend it up for 30 seconds. Done! Add it back to the pot.
Add sauce to mushroom and shrimp mixture. Mix well. Pour over fish, and bake an additional 15 minutes or so. Fish will be done when it flakes with a fork. Thick fillets will take longer to cook. The internal temperature of the fish should be 145 F with a meat thermometer.
Serve with extra sauce spooned over fish. Enjoy!
🧾 Why do I use Cod fillets?
Cod is a highly nutritious fish that is rich in protein, omega-3 fatty acids, vitamins, and minerals. It is also low in calories and contains very little fat. Eaten in moderate amounts it is healthy for you. Plus, it is affordable where I live, which is not anywhere near an ocean, unfortunately.
🥗 Side dishes
- Grilled or steamed vegetables.
- Instant Pot Rice is our favorite side dish to serve with this creamy sauce.
- Potatoes, either mashed, baked, or crispy oven-roasted potatoes.
- Garden Salad.
- Pasta of your choice.
🌡️ How to store
If you have any leftovers (we never do), simply let fish cool for no more than 1 hour, then place them in a container with a tight-fitting lid. Keep in the fridge for not more than 2 days. Simply rewarm in the oven or on the stove in a pot.

I hope you like this Oven Baked Cod Fillet In Shrimp and Mushroom Sauce as much as we do!
Please let me know in the comments below how you enjoyed the recipe, or send me an email on my Contact Page.
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📋 Recipe

Perfect Oven Baked Recipe For Cod Fillet In Shrimp and Mushroom Sauce
Ingredients
- 1.5 pounds cod fillets
- 2 tablespoon olive oil
- 1 cup mushrooms sliced
- ½ onion chopped
- 3 cloves garlic finely chopped
- 1½ cups shrimp peeled with tail removed, chopped
- 3 tablespoon butter or margarine
- 3 tablespoon flour
- ½ teaspoon salt
- ⅛ teaspoon pepper
- ½ teaspoon paprika
- 2 tablespoon parmesan cheese
- 1½ cups milk
- 2 tablespoon lemon juice optional
Instructions
Directions For Cod Fillet
- Preheat oven to 400 degrees Fahrenheit.
- Lightly grease a 9x13 baking dish.
- Place cod fillets in the baking dish.
- Sprinkle with salt and pepper on each fillet.
- Bake, covered, for 15 minutes.
Directions For Shrimp and Mushroom Sauce
- In a large frying pan, saute 1.5 cups of shrimp with ½ onion and 3 cloves of garlic in 1 tablespoon of olive oil for about 5 minutes. Continue to cook until shrimp turns pink.
- Add 1 cup of sliced mushrooms to the shrimp mixture and sautee for 3-4 minutes.
- In a separate pan, melt 3 tablespoon of butter or margarine over medium-low heat. Add in 3 tablespoon of flour. Whisk together until smooth.
- Add ½ teaspoon salt, ⅛ teaspoon pepper, ½ teaspoon paprika, and 2 tablespoon parmesan cheese to butter and milk mixture.
- Whisking steadily, pour in 1.5 cups of milk. Continue to heat until the mixture begins to thicken.
- If you would like a little bit of lemon flavor to your sauce, add 2 tablespoon of lemon juice. HOWEVER, this may make your milk curdle. If this happens, not to worry, just pour the sauce mixture into a blender and blend it up. Done! Add it back to the pot.
- Add sauce to mushroom and shrimp mixture. Mix well.
- Pour over fish, and bake an additional 15 minutes. Fish will be done when it flakes with a fork. Thick fillets will take longer to cook. The internal temperature of the fish should be 145 F with a meat thermometer.
- Serve with extra sauce spooned over fish.
- Enjoy!
Mihaela | https://theworldisanoyster.com/
You just offered me the perfect recipe for tonight's dinner! Thanks:)
Lara
Three of my favourite ingredients!
Adding this one to my meal plan, can’t wait to make it. I think I’ll serve it with a side of saffron rice and some asparagus.
Chef Dennis
I love fish dishes, too! This Oven Baked Recipe For Cod Fillet In Shrimp and Mushroom Sauce looks absolutely scrumptious.
Lindsay
This looks amazing, love the extra protein from the shrimp! Fabulous dinner recipe.
Jeri
Thank you so much, Lindsay!
Lara
I had some extra shrimp and decided to try this over the weekend! It was amazing! My husband loved it! Will definitely be adding this to my favorites!
Jeri
Thanks for commenting, Lara! I'm so glad you liked it!