In a bowl is broken slightly milk and egg. In another bowl mix the flour, baking soda, sugar, vanilla, cocoa and the chopped chocolate. Once the dry ingredients, mix thoroughly them add egg-milk mixture. Stir with a spoon until homogeneous. With a ladle to scoop up the mixture and pour into warm and lightly brushed with butter pan. When the mixture poured into a pan, first spread to the desired thickness (about 0.51 cm), then allowed to form bubbles when the upper side slightly dry, turning the pancake to baking and to the other side. Can be served hot or cold, garnished with honey, cream, fruit, chocolate or another of your choice. * The thickness of pancakes may be different - thicker become juicy. These pancakes are thicker than usual, so do not expect to be able to wound. * The chocolate may be dark, milk, white or even nuts. If using white stands and pancakes are more interesting. * If you love the taste of dark chocolate, put at least 4 tbsp cocoa.