Drain the tuna: Open the can of tuna and pour it into a fine mesh strainer, pressing gently with a fork to remove as much water as possible, about 1-2 minutes.
Combine ingredients: In a medium bowl, mix the drained tuna, shredded cheddar cheese, and egg with a fork until well combined, approximately 1 minute.
Add seasoning: If desired, sprinkle in your choice of seasonings and stir until evenly distributed throughout the mixture.
Form patties: Divide the mixture into four equal portions and gently form each into a compact patty about 3 inches wide and 0.5 inches thick.
Preheat the air fryer: Set your air fryer to 380 degrees Fahrenheit and let it preheat for about 3-5 minutes.
Arrange patties: Place the tuna patties in a single layer in the air fryer basket, leaving a small amount of space between each one for air circulation.
Cook the melts: Air fry at 380 degrees Fahrenheit for 12-15 minutes, until the edges are golden brown and the cheese is melted and bubbly.
Check for doneness: The patties should be firm to the touch and the edges should have a crispy, golden appearance when finished.