Preheat the oven to 220°C (425°F) and grease a baking pan with butter.
Grate the mozzarella. In a large bowl, mix the cheese, flour, salt, baking powder, sweetener (allulose or erythritol) and room temperature butter. Thoroughly knead the butter with your hands with the crumbly ingredients.
Add the egg and cream. Knead the dough for a couple of minutes to ensure it sticks together, but do not let it become too soft and sticky.
Divide the dough into 8 portions. Roll into balls, flatten, and roll out to a thickness of less than a centimeter. Sprinkle a little sweetener on top.
Put the cookies on a baking tray and bake for 15-20 minutes.