In a large mixing bowl, combine the eggs, butter and vanilla, and whisk until pale in color, about 2 minutes. Stir in the buttermilk, then the flour, sugar, cocoa powder, baking powder, baking soda, salt and nutmeg. Gently fold in the chocolate chips.
Cook the waffles in a preheated greased waffle iron until done, following the directions for your own waffle iron. Serve immeadiately (or keep warm in a 200°F oven) with the ice cream of your choice and chocolate sauce. Waffles can be made ahead and wrapped in plastic wrap and served the next day or frozen for up to 2 weeks. Rewarm them in a toaster oven.