For a healthier twist on the classic grilled cheese, try this spinach and feta version. Start by wilting fresh spinach in a pan until wilted. Then, assemble your sandwich with crumbled feta cheese and the wilted spinach. Cook in the air fryer until the cheese is melted and the bread is crispy. The combination of the salty feta cheese and the nutritious spinach creates a flavorful and satisfying sandwich.