Add whole wheat flour, cocoa powder, baking powder, baking powder, salt and brown sugar to a large bowl and mix. Create a well in the middle of and set aside.
Add soya milk, eggs, vanilla extract to another bowl and whisk well.
Pour the egg mixture (from 2) into the well in the dry mixture (from 1). Using a fork, stir slowly in the middle of the well. Gradually draw in the flour from the sides of the bowl while stirring.
Heat 1 tsp of unsalted butter on a low/medium heat stove. Use a ladle to pour the batter into the pan and leave to cook for 1-3 minutes. Flip over once bubbles start to appear on the surface and cook for another 1-3 minutes. Repeat this step for the rest of the batter and serve