Preheat oven to 180ºC. Grease and line a 20cm square tin with baking paper.
Mash bananas in a bowl with half of the BakeAid or substitute.
Stir in the apple sauce, sugars, vinegar, water and remaining BakeAid or substitute.
Stir in flour, cocoa, soda and salt until combined.
Fold through 1/3 cup of the chocolate chips.
Pour the batter into prepared tin and sprinkle the remaining chocolate chips over the top.
Bake for 35 minutes or until a skewer inserted into the cake comes out clean.
Cool in tin before slicing.