Preheat oven to 180 and line a baking tin
Add all ingredients (except for chocolate chips) to a large mixing bowl and stir thoroughly until fully combined (the batter will be quite thick)
Then stir in the chocolate chips
Pour batter into baking tin and spread evenly
Cook for about 15 minutes and leave it to cool in the baking tin for a further 15 minutes
Then, remove from tin and place on a cooling rack for another 15-20 minutes so it is fully cool before cutting
Serve with an extra sprinkle of sea salt if desired!