Fiesta Baked Cod
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!

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
- Pat each cod filet dry with a paper towel and season with salt.
- Place in a square baking dish. Drizzle olive oil on top.
- Pour on balsamic vinaigrette and Rotel.
- Sprinkle on shredded cheddar cheese.
- Bake at 425 degrees for 10 minutes! Serve with lemon wedges or a drizzle of lemon juice.
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.
Explore 680+ keto recipe videos with step-by-step instructions, tips, and tricks to make keto easy.
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
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.
Add flavor
Evenly pour balsamic vinaigrette over the cod. Top with Rotel. Sprinkle shredded cheese all over.
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) →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.


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?
I cut my cod in smaller pieces to get them to fit in the 8 x 8 inch baking dish. It was 1 pound.
But you could add more cod without adding more cheese or Rotel.
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!
Do you use the oil or butter to grease the baking dish for the Fiesta cod?
I used avocado oil but you could use either