In a large bowl, mix all the ingredients together
Place the mixture in a parchment paper covered baking tray (I used a 20cm by 20cm baking square tray that was about 1-2 inches deep. This didn't fit the entire tray, but it covered about 3/4 of it)
Flatten the mixture to your desired height. You can garnish with some extra chocolate chips or sesame seeds here
Bake this for about 10-15 minutes, at 175 degrees Celsius, until the edges are slightly brown.
Once it has finished baking, let it cool down completely before you cut it into squares. You can prepare this the night before and leave it in the fridge overnight for the morning.