For a healthier twist on grilled cheese, try this spinach and feta version made in the air fryer. Saute fresh spinach with garlic until wilted, then mix it with crumbled feta cheese. Spread the mixture on one side of the bread, then cook in the air fryer until the cheese is melted and the bread is toasted. The combination of the spinach and feta creates a flavorful and nutritious grilled cheese.