Preheat oven to 160 deg C. Grease and flour a loaf pan.
Mix the flour, baking powder, sugar and salt. In a separate bowl, combine the milk and egg.
Add the milk mixture to the dry ingredients and mix until just combined.
Stir in walnuts and Parmesan. Pour into the prepared loaf pan. Bake for 45 minutes. Increase the temperature to 180 deg C and continue baking for a further 15 minutes.