Clean the Portobello mushroom with kitchen paper, and remove the stem.
Drizzle a bit of olive oil on the outer part of the cap and brush it all over.
Season the inside of the cap with salt and black pepper, then spread the garlic&herb cream cheese (or mix in a bowl regular cream cheese with garlic powder, salt, and chopped chives and parsley to taste).
Cover the top with shredded cheese, then place the mushrooms in the air fryer.
Bake at 320°F (160°C) for 8-10 minutes. Serve immediately.
Notes
You can also bake them in a preheated oven at 375°F (190°C) for about 15-20 minutes or until golden and bubbly.