Directions
- Preheat a skillet or griddle over medium heat.
- In a small bowl, combine tuna, mayonnaise, Dijon mustard, and chopped onion. Mix until well incorporated.
- Butter one side of each bread slice lightly.
- Place one slice, buttered side down, on the skillet. Spread the tuna mixture evenly over the bread.
- Sprinkle shredded cheddar cheese on top of the tuna mixture.
- Place the second slice of bread on top, buttered side up.
- Cook for 3–4 minutes until the bottom is golden brown. Carefully flip the sandwich and cook another 3–4 minutes until the cheese is melted and the bread is crisp.
- Remove from heat and let the sandwich rest 1–2 minutes before slicing.
- Optional: serve with sliced tomato, pickles, or a light salad on the side.
Recipe Details
Prep Time: 10 min
Cook Time: 8 min
Total Time: 18 min
Servings: 1 sandwich
Difficulty: Easy
Variations & Substitutions
- Swap cheddar for Swiss, provolone, or mozzarella cheese.
- Use canned salmon or chicken instead of tuna for a twist.
- Add chopped celery or bell peppers for extra crunch.
- Spread a little hot sauce or sriracha for a spicy version.
Serving Suggestions
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