Microwave the dark chocolate and butter for 30 seconds at a time, stirring each time, until melted and smooth. Set aside to cool slightly
Whisk eggs, milk and vanilla, and stir through cooled chocolate mixture until smooth
Sift flour, sugar, cocoa powder, baking powder and salt together in a large mixing bowl, and make a well in the centre
Pour in egg mixture and whisk until mostly smooth
Stir through white chocolate chips and cook in your waffle iron
Makes 8 large waffles
Serve with berries and whipped cream