Fiesta Baked Cod

Annie Lampella @ Ketofocus

By Annie Lampella, Pharm.D.

Published May 8, 2022 • Updated February 1, 2026

A quick family approved dinner idea when you only have 10 minutes

This post may contain affiliate links. See my disclosure policy.

This baked cod recipe only requires 4 ingredients and it comes together in about 10 minutes. Cod fish filets are baked with balsamic vinaigrette and Rotel to make a simple, keto-friendly homemade meal in minutes.

Sometimes, you only have a small window of time to get dinner on the table. Instead of reaching for fast food or processed meals, I like to keep it simple with easy, low carb dinners that don’t take a lot of time or effort. The fiesta baked cod recipe is one I make often. It’s made in one pot just like my skillet lasagna and egg roll in a bowl, so not only is dinner easy to make but clean up is a breeze!

a fork holding a flakey chunk of white fish

I usually have frozen fish on hand. It’s the protein I turn to when I forget to thaw something for dinner as fish only takes about 20 minutes to thaw if you put it in a cold water bath. Cod fish usually comes in portioned packets too, so I don’t have to weigh or cut the fish filets. Cod is an excellent protein choice for keto – it’s lean, filling and has zero carbs.

Since I make this easy baked cod recipe quite often, I always have a bottle of balsamic vinaigrette in my refrigerator and a can of tomatoes and chilies (aka Rotel) in my pantry. Give a sprinkle of cheddar cheese right before baking to balance the flavors. No need to mess with panko, breadcrumbs or a garlic butter sauce – this low carb baked cod has plenty of flavor without the crusted butter layer.

How to bake cod

  1. Pat each cod filet dry with a paper towel and season with salt.
  2. Place in a square baking dish. Drizzle olive oil on top.
  3. Pour on balsamic vinaigrette and Rotel.
  4. Sprinkle on shredded cheddar cheese.
  5. Bake at 425 degrees for 10 minutes! Serve with lemon wedges or a drizzle of lemon juice.
a cheesy fish casserole in a baking dish

Key ingredients

  • Cod – Cod is the preferred fish for this recipe, but any white fish will work. Cod is relatively inexpensive and accessible to most people. Tilapia will also work in this recipe.
  • Balsamic vinaigrette – I prefer the flavors of balsamic vinaigrette but if you only have balsamic vinegar, you can use that instead. The vinaigrette adds a hint of sweet and bold flavor to this dish. If you choose to use balsamic vinegar, just add a drizzle on top of the fish as to not overpower the flavors. Another option is just to use lemon juice. It will provide enough acid for the oven baked cod.
  • Rotel – Also known as a can of tomatoes with green chilies. This is the go-to pantry item if you want to add umami flavor with a kick.
  • Cheese – I prefer a sprinkling of sharp cheddar cheese on top to add a bold creamy flavor; however, you can substitute any cheese flavor in this recipe or completely omit if you are dairy free.
Youtube
639K+ subscribers
Discover More Keto Recipes on Our Channel

Explore 680+ keto recipe videos with step-by-step instructions, tips, and tricks to make keto easy.

Recipe
Print Pin

Fiesta Baked Cod

5 (1) Prep 2m Cook 10m Total 12m 4 servings

Ingredients

  • 1 pound cod filets
  • 2 tablespoons avocado oil, olive oil or melted butter
  • 1/4 cup balsamic vinaigrette
  • 4 oz Rotel, drained
  • 1/2 cup shredded sharp cheddar cheese

Step by Step Instructions

Step by Step Instructions

1
Layer cod & season

Preheat oven 425 degrees. Pat cod filets dry with a paper towel and add to the bottom of a square baking dish. Season with salt.

a white casserole dish with cod filets covering the bottom
2
Add flavor

Evenly pour balsamic vinaigrette over the cod. Top with Rotel. Sprinkle shredded cheese all over.

diced tomatoes and shredded cheddar cheese top raw cod fish in a casserole dish
3
Bake it

Bake in the oven at 425 degrees for 10 minutes or until the fish is cooked through.

melted cheese and diced tomatoes over baked fish
Tip Top with a squeeze of lemon juice, fresh parsley, garlic butter or lemon wedge.
Nutrition Per Serving 4 oz filet
233 Calories
18g Fat
18g Protein
3g Net Carbs
3g Total Carbs
4 Servings
Nutrition disclaimer

The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.

Calculate Your Keto Macros in 30 Seconds

Not sure if this recipe fits your daily targets? Our free calculator shows you personalized macros based on your goals, activity level, and body composition.

Get My Macros (Free) →

Get weekly keto recipes from Annie.

Join the list and get new recipes delivered to your inbox every week.

Fiesta Baked Cod

Frequently Asked Questions

Can I use frozen fillets?

Yes, you can use fresh or frozen fish for baking cod. Frozen fish is easy to keep in your freezer at all times and easier to find. Fresh is obviously easier to use as it is already thawed.

What temperature should I bake cod at?

Bake cod fillets at 425 degrees for 10 minutes. It's best if they are all the same thickness and size.

How do I know when cod is fully cooked?

Your fish will easily flake apart if you pull it with a fork. The flesh of the meat will also be a bright white color too.

Should I bake cod covered or uncovered in the oven?

It's best to bake this dish uncovered.

Similar Recipes

Others looking for “Fiesta Baked Cod” also liked:

pieces of baked cod in a baking dish topped with cheddar cheese and chunks of tomato

Fresh vs frozen seafood

You can use either fresh fish or frozen cod for this seafood recipe. I find it easier to use frozen since I readily have it in my freezer at all times. I prefer to get wild caught Alaskan cod as most Pacific cod fish tastes the best and the quality is better. Other white fish fillet can be used in this recipe like tilapia and halibut.

Thawing frozen fish

To safely thaw frozen cod, you have a couple of options:
  1. Place frozen cod in the refrigerator to thaw. This will take 1-2 days depending on the thickness of your fish fillets.
  2. Thaw using a cold water bath. Fill a bowl or dish with cold water and place frozen cod inside the dish. Keep the cod in it’s vacuum sealed individual pouches. Submerge and let sit for 20-30 minutes or until filets are thawed.
  Keep these important tips in mind when thawing frozen fish
  • Never thaw in warm or hot water. This will start to cook the fish from the outside while the inside may still be frozen.
  • Never thaw fish at room temperature on the counter for food safety reasons.
  • Don’t refreeze fish that was previously frozen.
two pieces of baked cod on a stack of white plates topped with tomatoes and parsley

Storage information

I don’t care for leftover fish, but if you don’t mind it and have some leftover baked cod fish, simply reheat in the oven or air fryer. Store cooked fish leftovers in the refrigerator for 1-2 days.
About the Author
Annie Lampella, Pharm.D.

Annie Lampella, Pharm.D.

Annie is a Doctor of Pharmacy, mom, and the recipe creator behind KetoFocus. With a B.S. in Genetics from UC Davis, she has over 14 years of experience developing family-friendly keto recipes based on the science of human metabolism.

Other Keto Dinner Recipes

A plate with creamy orzo pasta with spinach and sun dried tomatoes topped with sliced chicken and shredded parmesan cheese.
60 Mins
Low Carb Tuscan Chicken Pasta
5 Stars (1 Reviews)

This one-pot Tuscan chicken pasta is creamy, bold, and packed with Italian flavor—but without all the carbs. Each serving is high in protein, low...

See the Recipe
Crispy chicken cutlets on a wire rack topped with chopped parsley and lemon wedges near by.
30 Mins
Breaded Chicken Cutlets
5 Stars (2 Reviews)

These gluten-free, low-carb breaded chicken cutlets are juicy, tender, and way easier to make. No pounding needed. I found a simple method that keeps...

See the Recipe
Reviews 6
5 Stars (1 Reviews)
  1. J
    Jill Jul 7, 2023

    The recipe calls for 1 lb of cod but the video looks like 2, based on how full the pan is and number of pieces (1 lb for me was 3 pieces). Am I missing something?

    1. Annie Lampella
      Annie Lampella Jul 9, 2023

      I cut my cod in smaller pieces to get them to fit in the 8 x 8 inch baking dish. It was 1 pound.

    2. Annie Lampella
      Annie Lampella Jul 9, 2023

      But you could add more cod without adding more cheese or Rotel.

  2. S
    Sherrie Feb 8, 2023

    We had this last night and definitely will be making it again! And it was so easy to make! Thanks for all you do for the keto folks, Annie!

  3. A
    Amy Howe May 19, 2022

    Do you use the oil or butter to grease the baking dish for the Fiesta cod?

    1. Annie Lampella
      Annie Lampella May 22, 2022

      I used avocado oil but you could use either

Leave a Review