For a healthier twist on grilled cheese, try making a spinach and feta version in the air fryer. Start by wilting fresh spinach in the air fryer until it is wilted and tender. Then, assemble your sandwich with feta cheese and the wilted spinach. Cook in the air fryer until the bread is toasted and the cheese is melted. The combination of the savory feta cheese and the nutritious spinach is a winning combination.