Preheat oven to 300°F. Line two baking sheets with parchment paper.
In a large bowl, whisk together the egg yolks, cheese and salt until smooth.
In a bowl of a stand mixer, add the cream of tartar with the egg whites and beat on high speed until the egg whites form stiff peaks. You should be able to turn the bowl upside down without the egg whites falling out.
Very carefully fold the egg yolk mixture into the egg whites until mixed and no egg white streaks remain. Be careful to use a gentle folding motion and don't try using the mixer because you do not want to remove the air whipped in by the egg whites, otherwise the breads will collapse
With a large spoon, divide mixture into 12 even circles on the prepared baking sheets (6 per sheet). Bake on the middle rack about 25 minutes or until surface turns a golden brown. Place breads onto wire rack to cool.
Once they are completely cool, seal them in a ziplock bag or a Tupperware container overnight on the counter. The breads will change texture overnight and become very soft and bread-like.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.