Keto Tuna Melt

Creamy and delicious keto tuna melt made with healthy fats and hearty protein from the tuna. This open faced tuna melt is perfect low carb meal for lunch or dinner!

Bite size tuna melt open faced sandwich on a cutting board

Tuna on Toast

Looking for another delicious way to enjoy that keto tuna salad I shared?

Tuna salad and tuna melts are practically married. Yep. One goes perfectly with the other. Leftovers turned into a new delicious meal!

Simple yet perfectly healthy and filling meal the whole family will enjoy for lunch or dinner.

The best part is that tuna melts don’t feel like we’re eating leftovers. I mean, look at the gooey cheese! Gimme!

Believe me, this keto tuna recipe will become a staple in your weekly lunch/dinner schedule. This is because,

  • It is extremely easy to make – keto tuna melt will come out on a plate in just under 10 minutes.
  • It tastes heavenly – the flavors of tuna and cheese with all the crunchy vegetables really complement each other which will surely satisfy everyone’s palate at your home alike.
  • It’s highly nutritious – All ingredients that I have used here are wholesome, making it one of the healthiest canned tuna keto recipes that you can prepare.
  • It’s an ideal keto recipe – this keto tuna melt contains extremely low carbohydrates per serving. (note that I have used keto-friendly bread and ingredients).

But, before jumping straight to this scrumptious low carb tuna melt recipe, I want to discuss a few things about the ingredients.

Tuna on toast topped with tomato and melted cheese

Tomatoes On Keto Tuna Melt Sandwiches

Tomatoes are considered as fruits according to the botanical classification and as fruits generally contain high carbs per serving (20-25gms).

Many people tend to think that tomatoes too are not keto-friendly.

However, unlike other fruits tomatoes contain only 2-3 grams of net carbs per 100 grams serving (3.5 ounces), which is up to 10 times lower than most other fruits.

Note that these values may change according to the type of tomatoes you choose. For instance, cherry tomatoes have around 6 grams of carbs in their content.

Also, make sure that you use whole tomatoes because store-bought tomato products such as tomato juice, canned tomatoes, sauce, and salsa are often packed with sugar.

Additionally, tomatoes are a great source of dietary fibers along with vitamin C, B9, K, folate, and minerals like potassium.

Plus, it also contains a powerful antioxidant called Lycopene.
Various studies suggest that supplementing Lycopene helps to lower the harmful LDL cholesterol levels and thus protects us from various heart diseases.

Pro-tip – the highest concentrations of Lycopene are found in the skin so, the redder the tomato, the more Lycopene it has.

A horizontal view of tuna melt sandwiches on a wooden tray ready to eat.

Tuna Fish

As we all know that tuna is saltwater fish and contains NO or less than 1 gram of carbs per ounce of serving.

Moreover, they are fairly high in protein content an ounce of it can provide almost 5 grams of protein, which is especially great for this keto tuna melt recipe.

All of these make tuna an ideal food for the standard
ketogenic diet.

In addition, consuming tuna has many benefits. Some of them are,

  • Tuna is loaded with omega-3 fatty acids, which are considered heart- healthy because they tend to decrease the risk of strokes and heart failure.
  • It contains a high level of selenium, zinc, and protein which are essential to maintain proper immune system functions.
  • Consuming Tuna provides vitamin D which helps in the absorption of calcium and phosphorus thus, it strengthens your bones.
  • Tuna is a high protein, low carb, and low-fat food that is ideal for individuals who are trying to lose weight.

Besides these, I have also used celery, red onions, parsley, and lemon juice which not only uplift the overall flavors of the dish, but also provide many health benefits as they are filled with antioxidants.

Moreover, note that I have used low carb bread to keep this open faced tuna melt recipe keto-friendly.

Further, I love how customizable this keto tuna melt recipe is, for instance,

  • If you want to up-level on your keto diet you can totally skip the low carb bread and use tomato slices as the base.
  • If you like to change things up, you can replace celery with other crunchy vegetables of your choice.
  • You can alter the amount of cheese and mayo according to your daily caloric requirements.
An overhead photo of tuna melt sandwiches topped with cheese.

Low Carb Bread Options

For this recipe to keep it low carb be sure to use a bread that is sturdy, yet lower in carbohydrates.

I recently tried Franz Bakery Keto sandwich bread. This is probably one of the most wheat-like sliced white bread and the convenience can’t be beat.

Half of a slice is the perfect amount for an open faced sandwich. You can purchase this bread online or at Costco.

Some of my other favorite bread options are these low carb cheddar biscuits and this easy grain-free bread recipe. Let me know what your favorite breads are.

However, before experimenting, I would really suggest you to try this perfected version of the keto tuna melt recipe.

Bite size tuna melt open faced sandwich on a cutting board

More Keto Sandwich Fillings You Might Enjoy

Bite size tuna melt open faced sandwich on a cutting board

Keto Tuna Melt

Creamy tuna salad makes delicious keto tuna melt open faced sandwich. Top with your favorite cheese and add an additional slice of bread if desired.
5 from 1 vote
Print Pin Rate
Cuisine: American
Keyword: easy recipe, keto, low carb, sandwich, seafood, tuna
Prep Time: 10 minutes
Cook Time: 5 minutes
Total Time: 15 minutes
Servings: 8 Servings
Calories: 111kcal
Author: Sandra Shaffer


  • 4 cans 5 oz tuna packed in water, drained
  • ¼ cup celery finely diced
  • 2 tablespoons red onion finely minced
  • 1 teaspoon flat-leaf parsley finely minced
  • ½ – ¾ cup mayonnaise add a little at a time **see notes
  • 1 teaspoon mustard dijon or stone ground
  • 1 tablespoon freshly squeezed lemon juice
  • Salt and pepper to taste
  • Bread slices of your choice
  • Cheese slices
  • Butter
  • Tomato Slices


Tuna Salad

  • Drain and flake tuna, add to large bowl
  • Add celery, red onion, and parsley, stir to combine.
  • Add mayonnaise, mustard and lemon juice and stir until well combined
  • Season with salt and pepper to taste

To Serve

  • Bread: butter and toast in oven or in toaster to your desired darkness or you can leave the bread untoasted.
  • Tuna Salad: add desired amount of tuna salad to toast.
  • Cheese: Add cheeses slices and melt in oven or microwave.
  • Tomato: thinly slice tomato and add to top of salad, or on bottom.
  • Sprinkle with salt and pepper if desired.
  • Serve open faced or add another slice of toast for a sandwich.


Adjust mayonnaise to desired creaminess.
Serving depends on size of bread used.


Serving: 1g | Calories: 111kcal | Carbohydrates: 3g | Protein: 1g | Fat: 11g | Saturated Fat: 3g | Polyunsaturated Fat: 7g | Cholesterol: 12mg | Sodium: 182mg | Sugar: 1g


Please note that the nutritional information provided are guidelines and may vary based on the brand of products used. For your specific nutritional goals use My Fitness Pal or Verywell Fit recipe calculators. All content within this site is not intended as medical diagnosis or treatment and should not be considered a substitute for professional medical expertise.


Open faced tuna salad transforms into a delicious tuna melt topped with melted cheese. This simple recipe is healthy, filling and perfect for low carb and keto diet followers. #lowcarb #easyrecipe
Hugs Sandra Signature

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