- take a deep mixing bowl and combine egg yolk, milk, all-purpose flour, unsweetened cocoa powder, baking powder along with butter. Mix well until smooth. Now, beat the egg white until stiff peaks form and then add the brown sugar to it and mix well. In the meantime, heat a waffle maker and pour the batter onto the waffle iron structure. Bake it for 20-25 minutes. Allow it to rest for a while when baked and then remove. Garnish with icing sugar and chocolate syrup on top. Serve immediately.