Preheat your oven to 170 degrees and line a deep baking sheet 9” X 9”.
In a blender, puree the beans into a paste, then add the eggs, oil and vanilla and mix.
In a large mixing bowl , stir together the sugar, cocoa powder, baking powder, salt, coffee grounds and chocolate buttons. Then fold in the bean and egg mix and stir until fully combined.
Pour into your baking tray and bake for 35 minutes , allow to cool then divide into squares and enjoy