This air fryer grilled cheese recipe combines the goodness of spinach and feta cheese for a healthy and flavorful twist. Start by sautéing a handful of fresh spinach in a pan until wilted. Spread a layer of feta cheese on one slice of whole grain bread, top with the sautéed spinach, and add another layer of feta cheese. Place another slice of bread on top and lightly brush the outside of the sandwich with olive oil. Cook in the air fryer at 375°F for about 5 minutes, or until the bread is crispy and the cheese is melted. The combination of the tangy feta and the earthy spinach makes this grilled cheese a delicious and nutritious option.