Preheat oven to 300 degrees.
Line a baking sheet with parchment paper and spray with cooking spray.
Separate the eggs, keeping the yolk out of the whites.
Using a clean electric mixer, whip the egg whites and cream of tartar until stiff peaks form.
In a separate bowl, whisk together yolks, cream cheese and salt until smooth. Using a spatula, carefully fold the whites into the yolk mixture. Do not overmix. Your mix should still be somewhat fluffy.
Spoon mixture into 6 large mounds on the parchment paper and slightly flatten.
Bake 30-40 minutes, until golden brown.
Cool for 3 minutes on baking sheet, then transfer to a wire rack to cool completely.
Allow to cool before eating, as the texture changes and becomes more like bread as it cools. Makes 6 servings.