1Wash the eggplant and pat it dry. Cut it lengthwise (with the skin on). Score the cut sides in a deep diamond pattern without piercing the skin.
2Sprinkle the eggplant halves with salt, brush them with olive oil (including the incisions), and sprinkle with dried oregano. Place them in a suitable air fryer basket or tray.
3Preheat the air fryer to 205°C (400°F) for 5 minutes. Air fry the eggplant at 205°C for 15 minutes (20–25 minutes in a conventional oven).
4Meanwhile, prepare the quattro formaggi cream: mix the feta, mozzarella/cheddar, parmesan, cream cheese, garlic, and a pinch of oregano. Adjust salt to taste.
5Spread the cheese cream evenly over the browned eggplant halves. Air fry for another 15 minutes at 205°C, or until the topping is golden and bubbly.
6Serve hot with soft bread and a simple tomato salad. The crispy skin is edible — do not discard it!