Keto Tuna Melt
When it comes to comfort food, few dishes can compete with a classic tuna melt. With its gooey cheese and savory filling, this Keto Tuna Melt is not only delicious but also fits perfectly into a low-carb lifestyle. Made with simple ingredients, it’s a quick meal that you can whip up any time of day. Whether you’re enjoying it for lunch, dinner, or a late-night snack, this recipe is bound to satisfy your cravings while keeping your carb count low.
Why This Recipe Belongs in Your Rotation

This Keto Tuna Melt is a must-have in your recipe rotation for several reasons. First, it’s incredibly easy to prepare, making it a perfect choice for busy weeknights. Second, it’s packed with protein and healthy fats, ensuring that you feel full and satisfied without the heavy carbs typically found in traditional tuna melts. Lastly, the combination of flavors from the tuna, cheese, and fresh vegetables is irresistibly delicious. You’ll find yourself making this recipe again and again!
What You’ll Gather
- 4 cans (5 oz) tuna packed in water, drained
- 1/2 cup celery, finely diced
- 2 tablespoons red onion, finely minced
- 1 teaspoon flat-leaf parsley, finely minced
- 1/2 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 (low-carb or keto-friendly)
- Cheese slices (cheddar or your favorite)
- Butter
- Tomato slices
Equipment at a Glance
- Mixing bowl – for combining the tuna melt ingredients
- Skillet or frying pan – for cooking the melts
- Spatula – for flipping and serving
Keto Tuna Melt Cooking Guide

Step 1: Prepare the Tuna Mixture
In a large mixing bowl, combine the drained tuna, finely diced celery, minced red onion, and parsley. This blend of ingredients will create a refreshing and flavorful base for your tuna melt.
Step 2: Add the Creaminess
Stir in the mayonnaise gradually until you reach your desired creaminess. You can start with 1/2 cup and add more if needed. Then, add the mustard and freshly squeezed lemon juice. Season with salt and pepper to taste. Mix everything well until all the ingredients are well incorporated.
Step 3: Assemble the Melts
Butter one side of each slice of your chosen bread. On the unbuttered side, spread a generous amount of the tuna mixture. Top with cheese slices and a few tomato slices. Place another slice of bread on top, buttered side out.
Step 4: Cook the Melts
Heat a skillet over medium heat. Once hot, carefully place the assembled tuna melts in the skillet. Cook for about 3-4 minutes on each side or until the bread is golden brown and the cheese has melted.
Step 5: Serve and Enjoy
Once cooked, remove the melts from the skillet and let them cool for a minute before slicing. Serve warm and enjoy the gooey goodness of your Keto Tuna Melt!
Ingredient Swaps & Substitutions

- For a vegan option, you can try a Vegan Carrot Chickpea Tuna Melt using chickpeas instead of tuna.
- If you prefer a different flavor, feel free to experiment with various types of mustard or add some spices like paprika or garlic powder.
- Instead of traditional bread, you can use low-carb tortillas or cloud bread for an even more keto-friendly option.
- Swap out the cheese for a dairy-free alternative if you’re lactose intolerant.
Behind the Recipe
The Keto Tuna Melt is a nostalgic dish that has evolved over the years. Traditionally, tuna melts were made with white bread and processed cheese, but with the rise of low-carb diets, it has been reimagined to fit modern dietary preferences. This recipe embraces the classic flavors while making it accessible for those following a ketogenic lifestyle. The combination of protein from the tuna, healthy fats from the mayonnaise, and the crunch of fresh vegetables makes it a wholesome meal option.
Storing Tips & Timelines
If you have leftovers (if there are any!), store them in an airtight container in the refrigerator for up to 2 days. Reheat them in a skillet for the best results, ensuring the bread remains crispy. You can also prepare the tuna mixture ahead of time and store it in the fridge for up to 3 days; just assemble and cook your melts when you’re ready to enjoy them.
Common Questions
Can I use canned tuna in oil instead of water?
Yes, using canned tuna in oil can add more flavor and healthy fats. Just make sure to adjust the amount of mayonnaise accordingly for the right consistency.
Is this recipe suitable for meal prep?
Absolutely! The tuna mixture can be made ahead of time and stored in the fridge. Just assemble and cook the melts when you’re ready to eat.
Can I freeze the tuna melts?
While it’s not recommended to freeze the assembled melts, you can freeze the tuna mixture itself for up to 2 months. Thaw it in the refrigerator before using it to prepare your melts.
What sides pair well with Keto Tuna Melt?
For a complete meal, consider serving your Keto Tuna Melt with a side of Healthy Cauliflower Fried Rice Recipe or a fresh salad for added nutrients and crunch.
Similar Recipes
- Air Fryer Grilled Cheese – A quick and easy twist on a classic comfort food.
- Vegan Carrot Chickpea Tuna Melt – A plant-based version that’s just as satisfying.
- Healthy Cauliflower Fried Rice Recipe – A delicious and healthy side dish.
Serve & Enjoy
Now that you have all the details on how to make this scrumptious Keto Tuna Melt, it’s time to get cooking! This recipe is perfect for a quick lunch or dinner and is sure to impress anyone at your table. With its creamy filling, melty cheese, and crispy toast, it’s a comforting and satisfying meal that you’ll love to share. Enjoy every bite of your Keto Tuna Melt!

Keto Tuna Melt
Ingredients
Equipment
Method
- In a large mixing bowl, combine the drained tuna, finely diced celery, minced red onion, and parsley.
- Stir in the mayonnaise gradually until you reach your desired creaminess. Then, add the mustard and freshly squeezed lemon juice. Season with salt and pepper to taste. Mix everything well.
- Butter one side of each slice of your chosen bread. On the unbuttered side, spread a generous amount of the tuna mixture. Top with cheese slices and a few tomato slices. Place another slice of bread on top, buttered side out.
- Heat a skillet over medium heat. Once hot, carefully place the assembled tuna melts in the skillet. Cook for about 3-4 minutes on each side or until the bread is golden brown and the cheese has melted.
- Once cooked, remove the melts from the skillet and let them cool for a minute before slicing. Serve warm and enjoy!
Notes
- For a vegan option, use chickpeas instead of tuna.
- Experiment with different types of mustard or add spices like paprika.
- Use low-carb tortillas or cloud bread for a keto-friendly alternative.
