Pre-heat the oven to 190°C and line or grease a square or rectangle baking tin.
In a bowl, mix all of the dry ingredients together and put to one side.
In a separate bowl, combine all of the wet ingredients until well mixed.
Add the dry ingredients to the wet a little at a time, making sure everything is well combined. Lastly, stir in 70g of the chocolate (retain the other 30g to sprinkle on top).
Pour the batter into the prepared tin and sprinkle with the remaining chocolate. Bake for around 25-30 minutes until an inserted skewer comes out clean. Allow to cool and then cut into squares. Enjoy!