In a bowl, mash the banana and whisk in the eggs, milk, and optional maple syrup. Add buckwheat flour, cocoa powder, apple cider vinegar (this helps the pancakes rise and be fluffier!), salt, cinnamon, and sodium bicarbonate, then mix. Heat a pan over medium heat with some olive oil and pour batter, cooking until bubbles form on the surface, then flip and cook for 1-2 extra mins. I added some greek yoghurt for extra protein and berries for polyphenols! Enjoy!