Turn on your waffle maker, with the setting on medium. In a large bowl, whisk together the flour, baking powder, baking soda, cocoa powder and set it aside.
In a separate bowl beat the eggs with the sugar until it becomes fluffy and triple in volume.
In a separate bowl mix all the liquid ingredients.
Combine the wet and the dry ingredients together. And fold the egg and sugar mixture in.
When your waffle maker is ready, grease it with butter or oil and pour or spoon the batter into the wells, until they almost come to the edge. You will know if you've over-filled it because the batter will spill out of the waffle maker. As you make the batches, the batter may thicken while it sits. If you want, thin it out a bit with some water.
Cook until the waffle maker indicator indicates that the waffles are ready, or wait until steam stops rising out of the waffle maker. Gently pull the waffles out with a fork.
Serve while they are warm.