This recipe is for devoted chocolate lovers - you feel the taste of chocolate in your mouth minutes after you have swallowed the last bite. It is not for people who prefer sweet desserts and the mild taste of milk chocolate - cookies get slightly bitter. The main reason I do them again and again is because the chocolate inside them is soft and remains melted even the day after they are prepared. Recipe is from here and it is for 8 cookies. The original has chocolate chips as an ingredient, but I prefer to make these cookies with chopped chocolate because chocolate chips tend to keep their shape while baking and I want to obtain a more homogenous velvety texture. These cookies are perfect for making ice cream sandwiches.
If you prefer crunchy cookies with emphasis on the butter as a taste, I can recommend you the Crunchy buttery cookies.