Preheat the oven to 300°F. Line a baking sheet with parchment paper.
In a large bowl, combine the cottage cheese and egg yolks. Mix until smooth.
In another bowl, beat the egg whites and cream of tartar together until stiff peaks form.
Gently fold the almond flour and salt into the cottage cheese mixture. If using, add honey or maple syrup for sweetness.
Carefully fold the beaten egg whites into the cottage cheese mixture until just combined. Be gentle to keep the mixture light and airy.
Gently fold in the blueberries.
Spoon the mixture onto the prepared baking sheet in 6 equal mounds, shaping them into rounds.
Bake for 25-30 minutes, or until the tops are golden brown and the bread is set.
Allow the cloud bread to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.