This spinach and feta air fryer grilled cheese recipe is a delicious and nutritious option. Sautéed spinach, crumbled feta cheese, and sliced tomatoes are layered between two slices of bread and cooked in the air fryer until crispy and melty. The spinach adds a dose of vitamins and minerals, while the feta cheese adds a tangy and salty flavor. Serve with a side of tzatziki sauce for dipping.