Preheat the oven to 375°F and line a baking sheet with parchment.
In a food processor, combine flour, baking powder, and salt. Pulse to blend.
Add the butter and pulse until the mixture resembles coarse crumbs.
Toss in the cheese and rosemary. Pulse again until just combined.
Drizzle in water, one tablespoon at a time, pulsing until dough comes together.
Roll the dough out between two sheets of parchment to about 1/8-inch thick.
Cut into desired shapes—squares, stars, whatever you like—and transfer to the baking sheet.
Bake for 15–18 minutes or until golden at the edges. Cool on a rack and snack away.