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Home » Recipes » Easy Fish Recipes

Fish Omelette

felice kaufman author bio
Modified: Apr 21, 2026 · by Felice Kaufman · This post may contain affiliate links · 1 Comment
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Here's how to make a moist fish omelette using leftover fish, eggs, butter, cilantro, onions, and avocado. It's high in protein, easy to make, and a great way to start your day.

fish omelette with Mexican seasoning
Jump to:
  • Omelette Flavor Options
  • Ingredients
  • How To Make a Fish Omelette
  • High Protein Sides
  • Leftovers
  • Seafood Dinner Recipes
  • Fish Omelette Recipe

I usually make extra dinner so I have something ready for the morning.

This morning, I used leftover blackened swordfish to make a quick breakfast omelette.

Fish is a great addition to any omelette. Use what you've got. Use up your snapper, mahi mahi, grunts, shrimp, what ever you cooked last night and add to your omelet!

Smoked salmon or a packaged salmon loin works too and it's already cooked.

Omelette Flavor Options

Cajun Flavor: Blackened fish with south-of-the-border flavors including cilantro, onion, and lime.

Summer Omelette: For a summer flavor combo, try cooked or smoked salmon with fresh dill, red onions, and a dollop of whipped cream cheese.

Mediterranean Style: Use cooked white fish, chopped tomatoes, olives, and crumbled feta. Finish with a pinch of oregano.

Scallion & Soy: Use cooked flaked white fish or shrimp with chopped scallions and a splash of coconut aminos or tamari soy sauce. Garnish with toasted sesame seeds.

Potato & Pepper: Mix in cooked diced potatoes, sautéed bell peppers, and mild white fish. Top with a sprinkle of sweet paprika.

swordfish omelette ingredients

Ingredients

Makes 1 omelette

  • Cooked fish
  • Eggs
  • Salt and pepper
  • Butter
  • Cilantro
  • Red onion
  • Avocado

TIP: Omelettes take a few minutes to make so have all of your ingredients lined up before you turn on the stove.

How To Make a Fish Omelette

  • Fish: I'm using leftover cooked roasted swordfish recipe in this omelet. I brushed this fish with melted butter, seasoned with blackened seasoning in a pre-heated 400°F oven for 15 minutes. Chop the fish into bite size pieces before you begin.
  • Veggies and Fruits: Chop the cilantro and onions, slice the avocado, and sprinkle it with lime juice to keep it fresh. Get everything prepped before you start cooking. You can also use other vegetables like bell peppers, tomatoes, spinach, or cooked potatoes.
how to make a fish omelet
  1. Cut the cooked fish into bite-sized pieces and chop the cilantro, onions, avocado and lime.
  2. Heat a small nonstick skillet over medium heat and melt a little butter. Add the cooked fish and onions and cook for about a minute to heat. Transfer to a plate and wipe out the skillet with a paper towel.
  3. While the fish is heating up, crack the eggs into a bowl, add a little salt and pepper and beat them with a fork.
    Add a tablespoon of butter to the skillet. Tilt the pan so the butter coats the surface.
  4. Pour in the eggs and let them sit undisturbed for about 30 seconds. Use a spatula to gently lift the edges as they set, letting the uncooked eggs run underneath. Keep lifting and tilting the pan so the eggs cook evenly. When they're almost set, add the warm fish and chopped cilantro.
  5. Fold the omelette in half and cook for another minute until the eggs are fully cooked. Slide onto a plate and enjoy with avocado slices.

Note: I topped this omelette with taco sauce that I had leftover from last night's swordfish tacos. The recipe is in the notes on the printable recipe card.

fish omelette for a high-protein meal

High Protein Sides

While an egg only has 6g of protein, four ounces of cooked swordfish has about 20 grams of protein.

Here are some suggestions to add more protein to your breakfast eggs:

  • Sliced avocado: 3 grams of protein. It's not a big protein source, but it adds healthy fats and fiber to keep you full.
  • Cottage cheese: A half-cup of low-fat cottage cheese has about 14 grams of protein.
  • Turkey sausage - Two small turkey sausage links have about 10-12 grams of protein
  • Steak - Two ounces has about 14-16 grams of protein. Try our steak and cheese omelet.

Leftovers

Wrap up your fish leftovers and fold into an omelet tomorrow morning. Here we have some pan seared snapper with sweet potatoes and mushrooms. The fish can be broken into one inch pieces and added to the omelette.

One fillet can make two nice size omelettes.

You can either fold the potatoes and mushrooms into the eggs with the fish or sauté them in a separate pan with a little butter.

Either way, you have the makings a healthy way to start your day!

fish and potatoes leftovers

Seafood Dinner Recipes

Cooking in the Keys is a food blog from Key Largo, Florida. Try our fresh caught yellowtail snapper, mahi mahi with cream sauce, pan-fried grouper cheeks, and spiny lobsters!

Another easy option is fried swordfish steaks, which cook quickly in a skillet with a crunchy panko coating.

Visit Key West Fish Recipes for a full list of our fish recipes.

breakfast fish omelette

Fish Omelette Recipe

Felice Kaufman
This fish omelette is a quick meal made with cooked fish, fresh herbs, and creamy avocado. It's perfect for breakfast, brunch, or a light lunch and a great way to use leftover fish and pack in protein. This recipe is low carb and gluten-free.
2
Print Recipe Pin Recipe
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Prep Time 5 minutes mins
Cook Time 2 minutes mins
Total Time 7 minutes mins
Course Dinner, Lunch
Cuisine American
Servings 1 serviing
Calories 358.8 kcal

Ingredients
  

  • ¼ cup chopped cooked fish
  • 2 large eggs
  • salt and pepper to taste
  • 1 tablesppon butter
  • 2 tablespoons chopped fresh cilantro
  • 2 tablespoons diced red onion
  • ½ avocado, sliced

Instructions
 

  • Cut the fish into bite-sized pieces and chop the cilantro, onions, avocado and lime.
    chopping cooked fish
  • Crack the eggs into a bowl, add a little salt and pepper and beat them with a fork until the whites are broken down.
  • Heat a small nonstick skillet over medium heat and melt a little butter. Add the cooked fish and onions and cook for about a minute to heat. Transfer to a plate and wipe out the skillet with a paper towel.
    heating fish and onions
  • Add a tablespoon of butter to the skillet. Tilt the pan so the butter coats the surface.
  • Pour in the eggs into the pan and let them sit undisturbed for about 30 seconds. Use a spatula to gently lift the edges as they set, letting the uncooked eggs run underneath. Keep lifting and tilting the pan so the eggs cook evenly. When they're almost set, add the warm fish and chopped cilantro.
  • Fold the omelette in half and cook for another minute until the eggs are fully cooked. Slide onto a plate and enjoy with avocado slices.
    cooking a fish omelette in a nonstick pan

Notes

Taco Sauce

Mix the 2 T mayo, 2 T sour cream, ½ teaspoon garlic powder, juice of 1 lime, 1-2 teaspoons hot sauce or sriracha, and a pinch of salt in a small bowl. Stir until smooth.

Nutrition

Calories: 358.8kcalCarbohydrates: 11.1gProtein: 25.2gTotal Fat: 25gSaturated Fat: 5.8gCholesterol: 359.1mgSodium: 170.4mgPotassium: 821.1mgFiber: 7.1gSugar: 1.9gNet Carbohydrates: 4g
Tried this recipe? Leave a comment below & tag @cookinginthekeys on social!

More Easy Fish Recipes

  • Creamy fish chowder with cod, potatoes, carrots, bacon, parsley, and oyster crackers in a white soup bowl.
    Creamy Fish Chowder
  • Blackened grouper served on a white plate with coconut rice and lemon.
    Blackened Grouper Recipe
  • Grilled red snapper tacos with cabbage slaw, avocado, cilantro, and creamy sauce on toasted flour tortillas, served with Mexican street corn salad and lime wedges on a white plate.
    Grilled Red Snapper Tacos
  • Grilled red snapper fillet with charred baby broccoli and grilled lemon on a white plate with blackened seafood seasoning
    Grilled Red Snapper

Comments

  1. Steve Kass says

    May 06, 2025 at 12:39 pm

    5 stars
    I’ll be making this fish omelet tomorrow with leftover swordfish. Perfect timing!

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5 from 2 votes (1 rating without comment)

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Felice Kaufman image

Welcome!

Hi, I’m Felice. I live in the Florida Keys and share easy recipes made with fresh seafood, steak, and seasonal vegetables. Everything is inspired by island life, simple, delicious, and made with real food.

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