Preheat oven to 180°C (350°F) and line an 8x8 inch baking pan with baking paper.
Add the black beans, eggs, coconut oil, sugar free maple syrup, cocoa powder, vanilla essence, baking powder, salt and protein powder to a blender.
Blend until completely smooth.
Fold through the dark chocolate chips.
Pour the mixture into the prepared pan.
Bake for 20 to 25 minutes, then allow to cool completely before slicing into 9 brownies.
