Preheat your air fryer to 370°F (188°C). Preheating is essential because it guarantees that your sandwich cooks evenly from the moment it hits the basket.

Butter the outer sides of the bread slices generously. This not only aids in crisping the bread but also adds that rich, buttery flavor. Layer the cheese in the center. Place one slice of cheddar and one slice of Swiss, or mix up the cheeses according to your taste.

For extra flavor, sprinkle a pinch of garlic powder and a dash of salt and pepper on the cheese before putting the top slice on. If you find your bread is particularly thin, secure the sandwich with a toothpick so the top doesn’t pop off during cooking.

Now, place the assembled sandwiches in the air fryer basket. Set them in a single layer for even cooking. Air fry at 370°F for 5 to 6 minutes. Halfway through cooking, flip the sandwiches carefully to ensure both sides achieve that glorious golden brown. Keep an eye on them; depending on your bread type, you may want to adjust the cooking time.

Once they’re perfectly toasted, remove the sandwiches from the air fryer. Don’t forget to take out any toothpicks before serving. If you’ve done it right, your sandwiches will have that irresistible crunch on the outside and melty goodness inside.