Most bakers make chocolate chip cookies with the chocolate chips sold at the supermarket. To take your cookies up a notch, chop a piece of high-quality bittersweet chocolate. This recipe contains more butter and walnuts than the classic; it has gotten rave reviews.
Unless you are using silicone baking liners or nonstick sheet pans, brush 2 sheet pans with room-temperature butter. If you’re using a chunk of chocolate, chop it into