Add the flaxseed meal to a small bowl as well as the water. Whisk together and allow to sit to become gel like.
Strain and rinse black beans and add to blender. Add coconut oil, pure maple syrup, vanilla extract and flaxseed mixture. Blend on high until smooth and creamy.
In a large mixing bowl seive buckwheat flour, cacao powder and baking powder. Pour in ½ cup chocolate chips and mix with whisk to combine.
Pour black bean mixture into flour mixture and stir to combine.
Pour brownie mixture into baking paper lined brownie tin and place into oven.
After 25 minutes remove brownies from the oven and allow to cool slightly before slicing and serving.
Notes
Make flaxseed (linseed) meal by blending flaxseeds in a blender, bullet style blenders work well for this. Store black bean brownies in refrigerator.