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Kalyn's Kitchen

Baked White Fish with Onions, Peppers, Olives, and Feta

I‘ve been making Baked White Fish with Onions, Peppers, Olives, and Feta for years and love these flavors. And this tasty and easy way to cook fish is low-carb, Keto, low-glycemic, gluten-free, and South Beach Diet phase one. Use Seafood Recipes to find more recipes like this one.

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Baked White Fish with Onions, Peppers, Olives, and Feta found on KalynsKitchen.com

Baked White Fish with Onions, Peppers, Olives, and Feta is a recipe I came up with in the very earliest days of my blog, and it’s a favorite quick dinner that I’ve been making it for years. You can make this with any type of mild white fish, and using a topping with finely chopped red onion, red bell pepper, green olives, and Feta adds a lot of flavor to the mild-flavored fish.

There’s a small amount of mayo spread over the fish to keep the topping on, and that also keeps the fish moist when it’s baked at a high temperature. It’s important to start with room-temperature fish pieces, so the fish cooks quickly without the topping ingredients getting too done.  If green olives are a non-starter at your house, try it with capers instead, but please try this way of cooking fish if you like these flavors and I bet it will become a repeater at your house too!

Baked White Fish with Onions, Peppers, Olives, and Feta found on KalynsKitchen.com

Take the fish out of the fridge and let it come to room temperature while you chop up the red onion, red bell pepper, and green olives, and crumble the feta.  (Amazing chopping skills in this photo by my nephew Jake!) Heat the oil over medium-high heat and saute the red onion and red bell pepper about 3 minutes. Turn the heat to medium, add the green olives, and cook about 2 minutes more.  Turn off the heat and let the mixture cool a little before you stir in the feta.

If the surface of the fish seems wet, blot dry with paper towels so the mayo will stick. Season the fish with salt and pepper and spread a very thin layer of mayo over the top of each piece of fish.Stir the crumbled feta into the onion-pepper-olive mixture.

Use a spoon to spread the mixture over the top of the fish, pressing it down slightly as needed to get the topping to stick. Roast 10-15 minutes in a preheated 425F/220C oven.  (Cooking time will depend on the thickness of the fish, but it’s usually closer to 15 minutes unless the fish pieces are really thin. It’s done when the fish is opaque and firm to the touch and the topping is slightly browned.

Baked White Fish with Onions, Peppers, Olives, and Feta found on KalynsKitchen.com

For a low-carb dinner, this would be delicious served with Grilled Asparagus with Parmesan, Lemony Green Beans, or just a simple salad like you see in the photo.

More Tasty Roasted or Baked Fish You Might Enjoy:

Spice-Rubbed and Roasted Fish Fillets ~ Kalyn’s Kitchen
Baked Fish, Spinach, and Tomatoes in Foil Packets ~ The Kitchn
Baked Halibut with Sour Cream, Parmesan, and Dill Topping ~ Kalyn’s Kitchen
Baked Lemon Herb Cod ~ Sarah’s Cucina Bella
Baked White Fish with Pine Nut, Parmesan, and Basil Pesto Crust ~ Kalyn’s Kitchen

Baked White Fish with Onions, Peppers, Olives, and Feta

I‘ve been making Baked White Fish with Onions, Peppers, Olives, and Feta for years and love these flavors.


  • 2 large uniformly-thick white fish filets (see notes)
    (I used to use Tilapia, but now I’d use another fish such as halibut, orange roughy, cod, or sole)
  • 1/2 T olive oil (or less, depending on your pan)
  • 1/2 cup very finely diced red pepper
  • 1/4 cup very finely diced red onion (or sweet white onion)
  • 1/4 cup very finely diced green olives (or try chopped capers if you’re not a fan of green olives)
  • 1/3 cup crumbled Feta (or less if you’re not wild about feta)
  • 1-2 T mayo or lite mayo (I would not use fat-free mayo, which usually has added sugar.)


  1. Preheat oven to 425F/220C.
  2. Spray small glass or ceramic casserole dish with nonstick spray.
  3. Heat olive oil over medium-high heat in a nonstick frying pan and saute red pepper and onion about 3 minutes.
  4. Add olives and saute about 2 minutes more. Turn off heat.
  5. Put fish in casserole dish and season with salt and pepper.
  6. Spread a small amount of mayo evenly over the surface of each piece of fish.
  7. Stir feta into red pepper/onion/olive mixture and spread that over the top of fish. (Pile it on so all the mixture is used. It doesn’t matter if some falls off while it’s cooking, but press it down so it sticks as much as it can.)
  8. Bake until fish is opaque and white throughout and topping is barely starting to brown, 10-15 minutes. Thinner pieces of fish may be done in 10 minutes, but thicker ones will take the entire 15 minutes.
  9. Serve hot.


If your fish fillets are small this is probably enough topping for 3-4 pieces of fish.

Recipe created by Kalyn.

All images and text ©

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
Baked White Fish with Onions, Peppers, Olives, and Feta is a tasty low-carb recipe that’s a perfect Phase One dinner for the South Beach Diet, and would be great for most other low-carb eating plans. You could omit the Feta and use an approved mayo and this could even be Paleo.

Find More Recipes Like This One:
Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

Nutritional Information?
If you want nutritional information for a recipe, you can sign up for a free membership with Yummly and use the Yum button on my site to save the recipe and see the nutritional information. Another option is entering the recipe into this Recipe Nutrition Analyzer, which will calculate it for you.

Baked White Fish with Onions, Peppers, Olives, and Feta found on KalynsKitchen.com

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44 comments on “Baked White Fish with Onions, Peppers, Olives, and Feta”

  1. Any ideas on this recipe with using chicken breasts??

    • I think it has potential, but without experimenting I couldn't say just how to do it. The tricky part would be getting the chicken cooked through without drying it out. I think you'd need to brown the chicken in a pan just a little before you add the topping, maybe pound the chicken breasts to an even thickness as well. I'd love to hear how it works if you try it!

  2. Racheal, so glad you enjoyed the recipe.

  3. Thanks for the great recipe! I made it with pollock (what I had on hand) and it tasted amazing. A repeat for sure!

  4. Thanks Lori; don't you think just about everything tastes better with a little Feta!

  5. I am always looking for new ideas for fish. This sounds delicious! I especially like the addition of feta.

  6. Lydia, he's a keeper!

  7. Jacki, I do think capers will also be fantastic in this!

  8. This sounds perfect for Spring. My husband refuses to eat olives though, so maybe I'll substitute with some capers.

  9. Ruth, so glad you enjoyed it, and glad you like the blog too.

  10. My ingredients on hand were flounder and orange bell pepper. Used Spanish onion and capers (cut amount in half when substituting for the olives). Used too much olive oil light mayo, and astounded at how delicious the extra sauce was over the grilled asparagus (George Foreman). This recipe with its variations is now one of my favorites, and my mom's. Thank you. South Beach just became much more doable. I am so happy to find your blog!

  11. Colin, you're so welcome. And I agree, the variations are endless!

  12. This recipe, with many variations in ingredients and fish has been a staple on our table for the last year. Many thanks.

  13. Elle, I don't know if Hake is environmentally friendly, but I bet it's delicious in this. Glad to know the blog is helpful for you.

  14. I'm going to make it tonight – but with Hake, since that is what I have at home (I love Hake – do you know if it's environmentally friendly too?).

    I might be adventurous and add cherry tomatoes cut in half to the sautéed vegetables.

    Thanks for this recipe and for all the other ones – without your blog I would never be able to do the South Beach diet that works so well for me (my husband is so impressed with the results – he is joining me on the diet too!)

  15. MCH, so glad you liked it. (The funniest thing of all is that I just made that recipe today for one of my neighbors!)

  16. This was GREAT! Very yummy! I got some fresh tilapia and it was not fishy at all. Love the blend with the veggies/feta.

  17. Like the idea of adding capers, and it sounds like there are a few people who have enjoyed it that way!

  18. Loved this recipe! I added some capers to the topping and it was delicious! Yum Yum! Thanks for the great recipes.

  19. This recipte is fantastic. I used olives and capers together and it came out wonderful. Just last week I started on South Beach, looking to lose 60 pounds (preferably before I turn 30 next year!) and with your blog I can do it! Inspiring and helpful and great pictures. Thank you!

  20. Michelle, glad you're enjoying the blog!

  21. I just found your blog and I have found so many wonderful things. I made this tonight but with flounder and it was delicious!

  22. Glad people are still liking this (and thinking of variations that sound good too!)

  23. I made this! Thanks for the great recipe. My only addition was grape tomatoes. Not only does it add a pop of color, I really like the flavor and juice it adds as well.

  24. Adding capers instead of olives…. exonerates the olives, and gives the dish a kick. WOW

  25. I had a great tilapia recipe, but this one blows it out of the water. Thank you!

  26. Kalyn,

    I forgot to mention, too, that I ended up doing this with pollack since I didn’t have tilapia on hand. That fish worked just fine, so I suspect the “any mild white fish” could probably be added. I’d love to try this with corvina filets, but they’ve not been on sale yet where I shop. – Donna

  27. Donna, thanks for the feedback. I’m going to try it with capers too, and I think black olives would taste great with this combination also.

  28. Kalyn,

    I fixed this last night and did substitute capers for olives. Excellent. 🙂 I may try black olives next time since I almost always have them on hand and my capers supply is dwindling. -Donna

  29. I love Tilapia. It’s a wonderful piece of fish and that recice looks FABULOUS!

  30. Kalyn, what a lovely dish. I am so happy that you gave some substitutes for tilapia as I have never seen it in England ( not where I live anyway)and I have felt very tempted by this recipe. I love the crumbled feta!!1

  31. Thomas, you are too kind. I didn’t realize that Rand doesn’t have them any more, but you can get it from Amazon.com. I really think it makes a difference, especially for people like me who don’t have good natural light.

  32. Kalyn,

    i really like your photos, i think they do look great and we in our newspapers have probably used worse shots than yours, so kudos 🙂

    btw, it seems that your brother doesn’t sell the photobox anymore?


  33. Tanna, vegetarian fish, who could have imagined!

    Thomas, I take all the photos on KK unless otherwise credited. I use a Canon Rebel XT Digital SLR camera. The two lenses I use are a 50 MM 1:2.5 Macro lens and a 50 MM 1:1.8 lens. I basically know nothing about photography, and if I get a good shot it’s luck plus a good camera. I take nearly all my food shots inside this light box because my house faces north and I don’t get much natural light in my kitchen. I use Adobo Lightroom to edit the photos, really a great product and not too expensive. I take about 50 shots for every one that I use, which I think is key to getting good pictures. Even so, I’m often not quite satisfied with the photos, but I’m trying to learn more.

    Anh, I haven’t had baramundi. The Tilapia we get here is frozen too.

  34. Kalyn, Tilapia is available here in Australia – frozen products from China. I may try to use our fresh waterfish (barramundi) though. 😀

  35. hi,
    i just stumbled over your blog and was wondering where your photos come from?
    if you shot them yourself, what is your setup if i may ask?

    and, some of your recipes sound delicious 🙂


  36. This really looks lovely. I really have been enjoying Tilapia, didn’t know it was a vegetarian fish! I’ll see if I can’t give this a try.

  37. Chris, I agree, Tilapia is one of the best tasting fish you can buy. The fact that it’s a good choice is a huge plus.


    Anh, hope you like it. I’d be curious to know if you can get Tilapia in Australia. Some of the sites I saw said it’s raised in China a lot.

    Katie, thanks. I agree, never look back, except on the internet people find your past things and they haven’t seen your current ones. Scary thought.

    Anna, you must make the asparagus with parmesan. It’s awesome.

  38. this looks really good. the asparagus is one to add to my collection too!

  39. I love the topping! perfect to spice up the fish a bit.
    Pretty photo.
    You know what they say – never look back….

  40. Kalyn, thanks for a great recipe! I;ll give it a try after my next shopping round.

  41. Just found your site and have added it to my bookmarks. Thanks… this looks AWESOME!

  42. What a great recipe. I love, love, LOVE tilapia. I am always looking for new ideas on how to serve it. And, I was also excited to see is on the “best choice” list, a list I posted after my visit to the aquarium.

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