01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, blend sourdough discard, shredded cheddar, softened butter, sea salt, garlic powder, and smoked paprika until thoroughly combined.
03 - Gradually incorporate all-purpose flour, mixing until a shaggy dough forms. Drizzle in cold water, one tablespoon at a time, until the dough comes together.
04 - Transfer dough to a lightly floured surface and knead gently until smooth. Roll the dough to 1/8-inch thickness.
05 - Use a sharp knife or pizza cutter to slice dough into 1-inch squares. Arrange the squares on the prepared baking sheet.
06 - Prick each cracker with a fork and sprinkle generously with coarse sea salt.
07 - Bake for 16 to 20 minutes until golden and crisp, rotating the baking sheet halfway through for even browning.
08 - Cool crackers completely on a wire rack before transferring to an airtight container. Store at room temperature for up to one week.