Air Fryer Tuna Melt

Name: Air Fryer Tuna Melt
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 1 canned tuna ((142 grams no salt added can drained)); 1/4 cup freshly grated mozzarella cheese; 1/2 small red onion (finely chopped); 1 teaspoon sweet pickle relish; 1 rib celery; 3 tablespoons mayonnaise; 1 tablespoon freshly squeezed lemon juice; 1/2 teaspoon garlic powder; 1/4 teaspoon ground mustard; 1/4 teaspoon dill weed; 1/4 teaspoon cayenne (optional); kosher salt (to taste); ground black pepper (to taste); 4 ounces chunk mild cheddar cheese (cut in 6 slices); 2 tablespoons unsalted butter (softened); 4 slices bread