Preheat the oven to 200°C/400°F
Mash bananas into a large bowl with a fork
Add the egg, oil, rice malt syrup, milk, and vanilla to the bananas and mix together
Add flour, baking powder & sea salt and combine
Chop dark chocolate into small cubes unless you’re using chocolate chips. Add ¾ into the mixture and combine together
Pour batter into a square or rectangle baking tin lined with baking paper. Flatten to ensure batter is evenly distributed to the whole tin
Top with remaining chocolate and place into the oven to bake for 20 minutes
Check it’s cooked by placing a fork or toothpick to the slice and make sure it comes out clean. Depending on the depth of your tin, it could take an extra 5 minutes.
Let it rest for 10 minutes in the baking tin and a further 5-10 minutes on a cooling rack. Slice into squares and enjoy!