Preheat your air fryer to 300°F (150°C). Line your air fryer basket or tray with parchment paper or air fryer liners.

In a large, clean mixing bowl, add the egg whites and cream of tartar. Using an electric hand mixer, whip on high speed until stiff peaks form (the whites should hold their shape when the beaters are lifted). Set aside.

In a separate small mixing bowl, combine the egg yolks, softened cream cheese, salt, garlic powder, onion powder, and dried chives (if using). Mix until smooth and well combined, ensuring there are no lumps of cream cheese.

Gently fold the egg yolk mixture into the whipped egg whites using a rubber spatula. Be careful not to deflate the egg whites too much; the goal is to maintain as much air as possible for a light, airy texture.

Spoon the mixture onto the prepared parchment paper in 6 separate, round 'cloud' shapes, leaving some space between each as they will puff up slightly.

Carefully transfer the lined basket or tray to the preheated air fryer. Air fry for 8-12 minutes, or until the cloud breads are golden brown on top and firm to the touch. Cooking time may vary slightly depending on your air fryer model.

Remove from the air fryer and let cool slightly on a wire rack. They will firm up a bit more as they cool. Serve immediately as a bread substitute, for dipping, or as a base for open-faced sandwiches.