These buttery, crisp cheese straws blend flaky puff pastry with rich Parmigiano Reggiano and fragrant rosemary, creating an elegant, savory bite perfect for entertaining or snacking.
Line 2 large baking sheets with parchment paper; set aside.
Place a large sheet of parchment paper on a clean work surface. Sprinkle ½ cup cheese in center of parchment. Unfold and place 1 pastry sheet on top of cheese. Sprinkle an additional ½ cup cheese and 1 tablespoon rosemary on top of pastry sheet.
Place another sheet of parchment paper on top of the pastry-cheese stack; roll pastry stack into a 12×10-inch rectangle, pressing cheese and rosemary into pastry. Remove top paper. With a pizza cutter or sharp knife, cut pastry lengthwise into 16 (¾-inch-wide) strips.
To shape each cheese straw, stack 2 strips on top of each other. Holding both ends, twist ends in opposite directions to form a twisted pastry strip. Place the 8 twisted strips 1 inch apart on one of the prepared baking sheets, pressing ends down onto the baking sheet. Refrigerate for 30 minutes.
Repeat to make 8 more twisted strips using remaining pastry sheet, 1 cup cheese and 1 tablespoon rosemary. Place the twisted strips on the other prepared baking sheet; refrigerate for 30 minutes.
Preheat oven to 400°F. Bake twisted strips, one baking sheet at a time, on center oven rack for 12 to 13 minutes or until golden and crisp, rotating baking sheet halfway through. Transfer cheese straws to a wire rack; cool completely.