01 - Spread softened butter evenly over one side of each slice of bread. Sprinkle everything bagel seasoning on the buttered sides if desired.
02 - Layer two slices of cheddar cheese between each pair of bread slices, ensuring buttered sides are facing outward.
03 - Preheat the air fryer to 350°F (175°C) for 2 minutes.
04 - Arrange the sandwiches in the air fryer basket in a single layer. Cook for 5 to 7 minutes, flipping once halfway, until the bread is golden and the cheese reaches optimum melt.
05 - Remove from the air fryer and serve immediately, optionally paired with tomato soup for dipping.