Place the flour in a bowl and add the cold cubed butter. Add a pinch of salt.
Mix with your hands until the mixture resembles coarse wet sand.
Wash and finely chop the fresh rosemary, then add it to the bowl.
Grate the Parmesan cheese over the dough and mix everything together.
Add the beaten egg and mix to combine.
Add the water one tablespoon at a time until the dough just comes together.
Cover the dough and refrigerate for 1 hour.
Remove the dough from the refrigerator and place it on a clean work surface.
Preheat the oven to 350°F.
Roll out the dough with a rolling pin and cut into desired cookie shapes. Place on a baking sheet lined with parchment paper. Refrigerate for an additional 10 minutes.
Bake for about 10 minutes, until lightly golden.
Let cool on a wire rack before serving. Enjoy every bite!