Place the butter, cheddar, parmesan, flour, paprika and salt in a food processor.
Using the pulse action, process until the ingredients just come together. Remove the dough and form it into a ball.
Divide in half, then roll and shape each portion into a sausage 23 cm long x 3 cm wide.
Roll in baking paper and chill for 1 hour. The dough can be frozen at this point until ready to use.
Preheat the oven to 180C. Line a baking tray with baking paper. Unwrap the dough rolls and cut into 5 mm slices. Spread slices on the baking tray and bake for 12-15 minutes or until pale gold. Transfer the biscuits to a wire rack to cool.
Store in an airtight container untill ready to serve.