01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large bowl, cream together the softened butter and grated Parmesan until smooth.
03 - Add the flour, garlic powder, and ground black pepper. Mix until the dough just comes together.
04 - Turn the dough onto a lightly floured surface and gently knead until smooth.
05 - Roll the dough to 1/2 inch thickness. Cut into desired shapes such as rounds or rectangles.
06 - Arrange the pieces on the prepared baking sheet. Sprinkle each with flaky sea salt and chopped rosemary, pressing lightly to adhere.
07 - Bake for 18 to 20 minutes, or until the edges turn golden brown.
08 - Remove from oven and cool on a wire rack before serving.