Preheat your oven to 350°F (175°C) and prepare a baking sheet with parchment paper.

In a large mixing bowl, combine the all-purpose flour, grated Parmesan cheese, finely chopped fresh rosemary, salt, and black pepper.

Add the softened unsalted butter to the dry ingredients and work it into the mix until it resembles coarse crumbs.

Gradually pour in the water until a cohesive dough forms, adding more water if necessary.

Flour your work surface and roll out the dough to about 1/8-inch thickness.

Cut the rolled-out dough into desired shapes and place on the prepared baking sheet.

Check the spacing of the crackers and sprinkle sea salt on top if desired.

Bake for 15-20 minutes, watching closely for golden brown edges.

Allow the crackers to cool for about 10 minutes on the baking sheet before transferring to a wire rack.