01 - Preheat oven to 375°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, whisk together the flour, baking powder, and fine sea salt until evenly distributed.
03 - Add the shredded cheddar, grated Parmesan, cold diced butter, chopped chives, smoked paprika, and garlic powder. Work the mixture with your fingertips until it becomes uniformly crumbly.
04 - Drizzle in cold water one tablespoon at a time, gently mixing just until the dough comes together and holds its shape. Avoid overworking.
05 - Turn the dough out onto a lightly floured surface and roll to approximately 1/8-inch thickness. Cut into 2-inch squares or desired shapes using a knife or cookie cutter.
06 - Transfer the cut pieces to the prepared baking sheet, spacing them slightly apart for even crisping.
07 - Bake for 16 to 18 minutes, until the edges are deeply golden and the pieces are crisp throughout.
08 - Let the pieces cool on a wire rack. Serve warm or at room temperature.