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