To a large mixing bowl, add the mashed bananas, caster sugar, soy milk, apple cider vinegar, vegetable oil and vanilla. Mix well until all of your ingredients are fully combined.
Next, add the flour to the wet ingredients, followed by the baking powder and salt. Stir until just combined. Try not to over mix your batter as it may cause your muffins to have a tougher texture. Just make sure that there are no lumps of flour.
Break your chocolate into 1cm chunks then fold 50g of it into the batter.
You can now add the mixture to the pre-prepared cake liners. Distribute evenly so that each liner is almost full.
Add the other 20g of chocolate on top. You're now ready to bake!