Preheat: Preheat your air fryer to 375°F (190°C) for about 3 minutes.

Prep the Bread: Using a butter knife, spread the softened butter evenly on one side of each slice of bread, making sure to spread it all the way to the edges.

Assemble: Place one slice of bread, butter-side down, on a clean cutting board. Layer your cheese slices evenly over the bread. Top with the second slice of bread, butter-side up. (Tip: Secure the center of the sandwich with a wooden toothpick to prevent the top bread from flying off in the air fryer).

Air Fry: Carefully place the assembled sandwich into the preheated air fryer basket.

Cook and Flip: Cook for 5 minutes. Open the basket, carefully flip the sandwich using a spatula, and cook for an additional 3 to 5 minutes, or until the exterior is deeply golden brown and the cheese is fully melted.

Serve: Remove from the air fryer, remove the toothpick, slice diagonally, and serve immediately!