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Keto Tuna Melt Chaffle (Crispy, Cheesy & Low-Carb Comfort Food)
Isla Marie

Keto Tuna Melt Chaffle

A low-carb, keto-friendly sandwich made using crispy cheese waffles (chaffles) filled with creamy tuna salad and melted cheese. It’s rich, savory, and slightly crispy on the outside with a warm, gooey center. Perfect for quick lunches or light dinners.
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Prep Time 10 minutes
Cook Time 8 minutes
Total Time 18 minutes
Servings: 2
Course: Dinner, Lunch
Cuisine: American, Keto
Calories: 380
Ingredients Equipment Method Notes

Ingredients
  

For the Chaffle (Waffle Base):
  • 1 cup shredded mozzarella cheese
  • 1 large egg
  • 1 tablespoon almond flour optional, for structure
For the Tuna Filling:
  • 1 can 5 oz tuna (drained)
  • 2 tablespoons mayonnaise
  • 1 tablespoon celery finely chopped
  • 1 tablespoon onion finely chopped
  • ½ teaspoon mustard
  • Salt and black pepper to taste
For Assembly:
  • 2 slices cheddar cheese
Optional: lettuce, tomato slices

Equipment

  • Mini waffle maker
  • Mixing bowls
  • Fork or spoon
  • Spatula

Method
 

Step 1. Preheat Waffle Maker
  1. Preheat your mini waffle maker until hot and lightly grease if needed.
Step 2. Prepare Chaffle Batter
  1. In a bowl, mix shredded mozzarella, egg, and almond flour until well combined.
Step 3. Cook Chaffles
  1. Add half the mixture to the waffle maker and cook for 3–4 minutes until golden and crispy. Repeat for the second chaffle. Set aside.
Step 4. Make Tuna Filling
  1. In a bowl, combine tuna, mayonnaise, celery, onion, mustard, salt, and pepper. Mix until creamy and well blended.
Step 5. Assemble Sandwich
  1. Place one chaffle as the base, add tuna mixture, then top with cheddar cheese slices. Cover with the second chaffle.
Step 6. Melt and Finish
  1. Place the assembled sandwich back in the waffle maker or a skillet for 1–2 minutes until the cheese melts.
Step 7. Serve
  1. Serve hot, optionally with lettuce or tomato for added freshness.

Notes

  • Drain tuna well to avoid a watery filling.
  • Cook chaffles until crisp to hold the sandwich structure.
  • Almond flour improves texture but can be skipped.
  • You can substitute canned salmon for variation.
  • Use parchment paper if sticking occurs in the waffle maker.