From America's Test Kitchen Season 3: Cookie Jar Favorites
Our goal in creating a traditional double-chocolate cookie recipe seemed more like a fantasy: The first bite of the cookie would reveal a center of hot fudge sauce, the texture would call to mind chocolate bread pudding, and the overall flavor would be of deep and complex chocolate. Was it possible? In the end, the fulfillment of our fantasy relied on very basic ingredients—chocolate, sugar, eggs, butter, flour, baking powder, and salt. We used a modified creaming method with minimal beating to produce moist cookies that weren’t cakey, and we let the batter rest for a half-hour to develop a certain fudginess. Ingredient proportions were all-important—for moist, rich cookies, we had to use more chocolate than flour. The more highly processed semisweet chocolate tasted smoother and richer than unsweetened, and Dutch-processed cocoa—which many bakers find superior in flavor to regular cocoa—and instant coffee further enriched the chocolate flavor. At last, we had a cookie that was both rich and soft, with an intense chocolaty center.
Makes about 3 1/2 dozen cookies
To melt the chocolate in a microwave, heat at 50 percent power for 2 minutes, stir, then continue heating at 50 percent power for 1 more minute. If not completely melted, heat an additional 30 to 45 seconds at 50 percent power. Semisweet chocolate chips may be added for a bigger chocolate punch; if used, they will slightly increase the yield on the cookies. We recommend using a spring-loaded ice cream scoop to scoop the dough. Resist the urge to bake the cookies longer than indicated; they may appear underbaked at first but will firm up as they cool.