Pre heat your oven to 180C and line a loaf tin.
To a large bowl add your mashed banana, vegetable oil and caster sugar. Mix well until combined and then add your eggs, dairy free yoghurt and vanilla extract and mix again until fully combined.
Next add the gluten free flour, baking powder, salt and cocoa powder. Mix well until combined.
Pour in the shot of espresso and mix well. Leave to sit for a few minutes and then finally add your chocolate chips and mix again.
Pour into your lined loaf tin and place in the middle of your oven to bake for around 60 minutes. It may be slightly more or less so keep checking your oven until a skewer comes out clean.