Keto Tuna Melt Stuffed Tomatoes are a low-carb, protein-packed meal that combines juicy, oven-baked tomatoes with a creamy tuna filling and melted cheese on top. Perfect for lunch, dinner, or a light snack, these stuffed tomatoes are easy to prepare, satisfying, and fit perfectly into a keto or low-carb lifestyle.
The key is using fresh, ripe tomatoes as edible “boats” and filling them with a savory tuna mixture seasoned with herbs and keto-friendly ingredients, then topping with cheese for that classic melt flavor.
Ingredients
Main Ingredients
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4 large ripe tomatoes
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1 can (5 oz) tuna, drained
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2 tablespoons mayonnaise
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1 teaspoon Dijon mustard
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1 small celery stalk, finely chopped
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2 tablespoons red onion, finely chopped
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½ teaspoon garlic powder
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Salt and pepper to taste
Topping
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½ cup shredded cheddar or mozzarella cheese
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2 slices cooked bacon, crumbled (optional for extra flavor)
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Fresh parsley for garnish
Instructions
1. Prepare the Tomatoes
Cut the tops off the tomatoes and carefully scoop out the seeds and pulp. Be careful not to puncture the sides—these will serve as your “boats.”
Lightly season the inside of each tomato with a pinch of salt and pepper.
2. Make the Tuna Filling
In a mixing bowl, combine:
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Tuna
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Mayonnaise
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Dijon mustard
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Celery
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Red onion
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Garlic powder
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Salt and pepper
Mix thoroughly until well combined. Taste and adjust seasoning as needed.
3. Stuff the Tomatoes
Spoon the tuna mixture evenly into each hollowed-out tomato. Fill them generously, but don’t overstuff to prevent spilling during baking.
4. Add Cheese and Bacon
Sprinkle shredded cheese over the top of each stuffed tomato.
If desired, add crumbled cooked bacon on top for extra flavor and crunch.
5. Bake
Place the stuffed tomatoes on a baking sheet lined with parchment paper. Bake at 375°F (190°C) for 15–20 minutes, or until the cheese is melted and slightly golden.
6. Serve
Garnish with freshly chopped parsley. Serve warm as a light meal or appetizer.
Tips for the Best Keto Tuna Melt Stuffed Tomatoes
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Choose firm, ripe tomatoes
They hold their shape better during baking. -
Drain tuna thoroughly
Excess liquid can make the filling watery. -
Customize cheese
Cheddar, mozzarella, or pepper jack all work well. -
Optional add-ins
Add chopped pickles, capers, or fresh herbs for extra flavor.
Variations
Spicy Tuna Melt
Add a pinch of cayenne pepper or a few dashes of hot sauce to the filling.
Mediterranean Style
Mix in chopped olives, feta cheese, and sun-dried tomatoes.
Avocado Twist
Add diced avocado to the tuna mixture for extra creaminess.
Open-Face Tuna Melt
Top each tomato with a slice of keto-friendly bread before adding cheese and baking.
Storage and Reheating
Refrigeration:
Store leftover stuffed tomatoes in an airtight container for up to 2 days.
Reheating:
Reheat in the oven at 350°F (175°C) for 5–7 minutes or until warmed through.
Note: Avoid microwaving as it can make tomatoes watery.
Why You’ll Love This Recipe
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Quick and easy keto-friendly meal
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High in protein and healthy fats
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Low-carb and gluten-free
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Flavorful, cheesy, and satisfying
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Perfect for meal prep or entertaining
Keto Tuna Melt Stuffed Tomatoes are a delicious, low-carb way to enjoy the classic tuna melt flavors in a lighter, healthier format. With a creamy, seasoned tuna filling, gooey melted cheese, and optional crispy bacon, these baked tomatoes are perfect for a keto-friendly lunch, dinner, or snack.
They are easy to make, visually appealing, and packed with flavor—making them a must-try for anyone following a low-carb or ketogenic lifestyle.