1. Heat the oven to 160C, gas 3. Whisk the egg whites with a pinch of salt until stiff; start at a low speed then gradually increase.
2. In another bowl, whisk the egg yolks with the cream cheese and cream of tartar until thick and creamy. Carefully fold in around a quarter of the egg whites into the yolk mixture using a balloon whisk. Gently scrape in the rest of the egg white mixture into one side of the yolk mixture. Fold together carefully until just combined.
3. Spoon 8 blobs onto the baking sheets and cook for 15-20 mins or until lightly golden and spongy.